83004 JO IM No.7825-1/21
Ver.1.02
82202
LC87F74C8A
Overview
The LC87F74C8A is an 8-bit single chip microcontroller with the following on-chip functional blocks :
CPU : operable at a minimum bus cycle time of 100ns
128K-bytes flash ROM (on-board rewritable)
On-chip RAM : 4096-bytes
LCD controller/driver
Two high performance 16-bit timer/counters (can be divided into 8-bit units)
16-bit timer/PWM (can be divided into two 8-bit timers)
Four 8-bit timer with prescalers
Timer for use as date/time clock
Synchronous serial I/O port (with automatic block transmit/receive function)
Asynchronous/synchronous serial I/O port
15-channel 8-bit AD converter
High-speed clock counter
System clock divider
Small signal detector
20-source 10-vectored interrupt system
All of the above functions are fabricated on a single chip.
Features
Flash ROM
Single 5V power supply, on-board writable
Block erase in 128-byte units
131072 8-bits (LC87F74C8A)
Random access memory (RAM)
4096 9-bits (LC87F74C8A)
Minimum bus cycle time
100ns (10MHz)
Note : The bus cycle time indicates ROM read time.
Ordering number : ENN7825
CMOS IC
FROM 128K-byte, RAM 4096-byte on chip
8-bit 1-chip Microcontroller
LC87F74C8A
No.7825-2/21
Minimum instruction cycle time
300ns (10MHz)
Ports
Input/output ports
Data direction programmable for each bit individually : 26 (P1n, P30 to P35, P70 to P73, P8n)
Data direction programmable in nibble units
: 8 (P0n)
(When N-channel open drain output is selected, data can be input in bit units.)
Input ports
: 2 (XT1, XT2)
LCD ports
Segment output
: 48 (S00 to S47)
Common output
: 4 (COM0 to COM3)
Bias terminals for LCD driver
3 (V1 to V3)
Other functions
Input/output ports
: 48 (PAn, PBn, PDn, PEn, PFn)
Input ports
: 7 (PLn)
Oscillator pins
: 2 (CF1, CF2)
Reset pin
: 1 (RES)
Power supply
: 6 (VSS1 to 3, VDD1 to 3)
LCD controller
Seven display modes are available (static, 1/2, 1/3, 1/4 duty 1/2, 1/3 bias)
Segment output and common output can be switched to general purpose input/output ports.
Small signal detection (MIC signals etc)
Counts pulses with the level which is greater than a preset value
2-bit counter
Timer
Timer 0 : 16-bit timer/counter with capture register
Mode 0 : 2-channel 8-bit timer with programmable 8-bit prescaler and 8-bit capture register
Mode 1 : 8-bit timer with 8-bit programmable prescaler and 8-bit capture register + 8-bit
Counter with 8-bit capture register
Mode 2 : 16-bit timer with 8-bit programmable prescaler and 16-bit capture register
Mode 3 : 16-bit counter with 16-bit capture register
Timer 1 : PWM/16-bit timer/counter with toggle output function
Mode 0 : 2-channel 8-bit timer/counter (with toggle output)
Mode 1 : 2-channel 8-bit PWM
Mode 2 : 16-bit timer/counter (with toggle output) Toggle output from lower 8-bits is also possible.
Mode 3 : 16-bit timer (with toggle output) Lower order 8-bits can be used as PWM.
Timer 4 : 8-bit timer with 6-bit prescaler
Timer 5 : 8-bit timer with 6-bit prescaler
Timer 6 : 8-bit timer with 6-bit prescaler
Timer 7 : 8-bit timer with 6-bit prescaler
Base Timer
1. The clock signal can be selected from any of the following :
Sub-clock (32.768kHz crystal oscillator), system clock, and prescaler output from timer 0
2. Interrupts of five different time intervals are possible.
High speed clock counter
Countable up to 20MHz clock (when using 10MHz main clock)
Real time output
LC87F74C8A
No.7825-3/21
Serial interface
SIO0 : 8-bit synchronous serial interface
1. LSB first/MSB first is selectable
2. Internal 8-bit baud-rate generator (fastest clock period 4/3 tCYC)
3. Consecutive automatic data communication (1 to 256-bits)
SIO1 : 8-bit asynchronous/synchronous serial interface
Mode 0 : Synchronous 8-bit serial IO (2-wire or 3-wire, transmit clock 2 to 512 tCYC)
Mode 1 : Asynchronous serial IO (half duplex, 8 data bits, 1 stop bit, baud rate 8 to 2048 tCYC)
Mode 2 : Bus mode 1 (start bit, 8 data bits, transmit clock 2 to 512 tCYC)
Mode 3 : Bus mode 2 (start detection, 8 data bits, stop detection)
AD converter
8-bits 15-channels
Remote control receiver circuit (connected to P73/INT3/T0IN terminal)
Noise rejection function (noise rejection filter's time constant can be selected from 1/32/128 tCYC)
Watchdog timer
The watching time period is determined by an external RC.
Watchdog timer can produce interrupt or system reset
Interrupts : 18 sources, 10 vectors
1. Three priority (low, high and highest) multiple interrupts are supported.
During interrupt handling, an equal or lower priority interrupt request is postponed.
2. If interrupt requests to two or more vector addresses occur at once, the higher priority interrupt takes
precedence. In the case of equal priority levels, the vector with the lowest address takes precedence.
No.
Vector
Selectable Level
Interrupt Signal
1
00003H
X or L
INT0
2
0000BH
X or L
INT1
3 00013H
H
or
L INT2/T0L/INT4
4
0001BH
H or L
INT3/Base timer/INT5
5 00023H
H
or
L T0H
6 0002BH
H
or
L T1L/T1H
7 00033H
H
or
L SIO0
8 0003BH
H
or
L SIO1
9 00043H
H
or
L ADC/MIC/T6/T7
10
0004BH
H or L
Port 0/T4/T5
Priority Level : X>H>L
For equal priority levels, vector with lowest address takes precedence.
Subroutine stack levels : 2048 levels max. Stack is located in RAM.
Multiplication and division
16-bit 8-bit
(executed in 5 cycles)
24-bit 16-bit
(12 cycles)
16-bit 8-bit
(8 cycles)
24-bit 16-bit
(12 cycles)
Oscillation circuits
On-chip RC oscillation for system clock use.
CF oscillation for system clock use. (Rf built in, Rd external)
Crystal oscillation low speed system clock use. (Rf built in, Rd external)
On-chip frequency variable RC oscillation circuit for system clock use.
LC87F74C8A
No.7825-4/21
System clock divider
Low power consumption operation is available
Minimum instruction cycle time (300ns, 600ns, 1.2s, 2.4s, 4.8s, 9.6s, 19.2s, 38.4s, 76.8s can be switched
by program (when using 10MHz main clock)
Standby function
HALT mode
HALT mode is used to reduce power consumption. During the HALT mode, program execution is stopped but
peripheral circuits keep operating (some parts of serial transfer operation stop.)
1. Oscillation circuits are not stopped automatically.
2. Released by the system reset or interrupts.
HOLD mode
HOLD mode is used to reduce power consumption. Program execution and peripheral circuits are stopped.
1. CF, RC and crystal oscillation circuits stop automatically.
2. Released by any of the following conditions.
1. Low level input to the reset pin
2. Specified level input to one of INT0, INT1, INT2, INT4, INT5
3. Port 0 interrupt
X'tal HOLD mode
X'tal HOLD mode is used to reduce power consumption. Program execution is stopped.
All peripheral circuits except the base timer are stopped.
1. CF and RC oscillation circuits stop automatically.
2. Crystal oscillator operation is kept in its state at HOLD mode inception.
3. Released by any of the following conditions
1. Low level input to the reset pin
2. Specified level input to one of INT0, INT1, INT2, INT4, INT5
3. Port 0 interrupt
4. Base-timer interrupt
Package
QIP100E
TQFP100
Development tools
Evaluation chip
: LC876093
Emulator
: EVA62S + ECB876600 (Evaluation chip board) + SUB877400 +
POD100QFP or POD100SQFP (Type B)
: ICE-B877300 + SUB877400 + POD100QFP or POD100SQFP (Type B)
Flash ROM write adapter : W87FQ100 or W87FSQ100
Same package and pin assignment as mask ROM version.
1. LC877400 series options can be set using flash ROM data.
Thus the board used for mass production can be used for debugging and evaluation without modifications.
2. If the program for the mask ROM version is used, the usable ROM/RAM capacity is the same as the mask ROM
version.
LC87F74C8A
No.7825-5/21
Package Dimensions
Package Dimensions
unit : mm
unit : mm
3151A 3274
Pin Assignment
S20/PC4
S19/PC3
S18/PC2
S17/PC1
S16/PC0
S15/PB7
S14/PB6
S13/PB5
S12/PB4
S11/PB3
S10/PB2
S9/PB1
S8/PB0
S7/PA7
S6/PA6
S5/PA5
S4/PA4
S3/PA3
S2/PA2
S1/PA1
P0
6
P0
7
P1
0/
SO0
P1
1/
SI
0/
SB0
P1
2/
SCK0
P1
3/
SO1
P1
4/
SI
1/
SB1
P1
5/
SCK1
P1
6/
T1
PW
M
L
P
17/
T1
P
W
M
H
/B
U
Z
RE
S
XT
1
/
A
N
1
0
XT
2
/
A
N
1
1
V
SS
1
CF
1
CF
2
V
DD
1
P80
/
AN0
P81
/
AN1
P82
/
AN2
P83
/
AN3
P84
/
AN4
P85
/
AN5
P86
/
AN6
P8
7/
AN7
/
MI
CI
N
P70
/
IN
T0
/T
0L
CP/
A
N8
P
7
1/INT
1
/T
0HCP
/A
N9
P
7
2/INT
2
/T
0
I
N
P
7
3/INT
3
/T
0
I
N
S0/
PA0
V
3
/P
L
6
/A
N1
4
S
47/
P
F
7
S
46/
P
F
6
S
45/
P
F
5
S
44/
P
F
4
S
43/
P
F
3
S
42/
P
F
2
S
41/
P
F
1
S
40/
P
F
0
S
39/
P
E
7
S
38/
P
E
6
S
37/
P
E
5
S
36/
P
E
4
S
35/
P
E
3
S
34/
P
E
2
S
33/
P
E
1
S
32/
P
E
0
S
31/
P
D
7
S
30/
P
D
6
S
29/
P
D
5
S
28/
P
D
4
S
27/
P
D
3
S
26/
P
D
2
S
25/
P
D
1
S
24/
P
D
0
V
SS
2
V
DD
2
S
23/
P
C
7
S
22/
P
C
6
S
21/
P
C
5
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
1
2
3 4 5
6 7 8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
80 79
78
77 76 75
74
73 72
71 70
69
68 67 66
65
64 63
62 61
60
59 58 57
56
55 54
53 52
51
V2/PL5/AN13
V1/PL4/AN12
COM0/PL0
COM1/PL1
COM2/PL2
COM3/PL3
P30/INT4/T1IN
P31/INT4/T1IN
VSS3
VDD3
P32/INT4/T1IN
P33/INT4/T1IN
P34/INT5/T1IN
P35/INT5/T1IN
P00
P01
P02
P03
P04
P05
Top view
LC87F74C8A
SANYO:QIP100E
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