EM78870
8-bit Micro-controller
_________________________________________________________________________________________________________________________________________________________________
* This specification are subject to be changed without notice.
1
2001/08/29
I.General Description
The EM78870 is an 8-bit RISC type microprocessor with low power, high speed CMOS technology.
Integrated onto a single chip are on_chip watchdog (WDT), RAM, ROM, programmable real time clock /counter,
internal interrupt, power down mode, LCD driver, build-in KEY TONE clock generation, Programming Tone generators,
Serial Peripheral Interface(SPI), comparator and tri-state I/O. The EM78870 provides a single chip solution to design a
message_display.
II.Feature
CPU
Operating voltage range : 2.2V~5.5V(Normal mode), 2.0V~5.5V(Green mode)
32K 13 on chip Program ROM
2.5K 8 on chip data RAM
144 byte working register
Up to 51 bi-directional tri-state I/O ports (32 shared with LCD Segment pins)
IO with internal Pull high, wake-up and interrupt functions
STACK: 32 level stack for subroutine nesting
TCC: 8-bit real time clock/counter (TCC) with 8-bit prescaler
COUNTER1: 8-bit counter with 8-bit prescaler can be an interrupt source
COUNTER2: 8-bit counter with 8-bit prescaler can be an interrupt source
Watch Dog : Programmable free running on chip watchdog timer
CPU modes:
Mode
CPU status
Main clock
32.768kHz clock status
Sleep mode
Turn off
Turn off
Turn off
Idle mode
Turn off
Turn off
Turn on
Green mode
Turn on
Turn off
Turn on
Normal mode Turn on
Turn on
Turn on
12 interrupt source : 8 external , 4 internal
Key Scan : Port key scan function up to 16x4 keys
Sub-Clock: 32.768kHz crystal
Main-clock: 3.5826MHz multiplied by 0.25, 0.5, 1 or 3 generated by internal PLL
Key tone output (shared with IO) : 4kHz, 2kHz, 1kHz
Comparator: 3-channel comparators, internal (16 level) or external reference voltage (shared with IO)
Serial Peripheral Interface (SPI) : Interrupt flag available for the read buffer full, Programmable baud rates of
communication, Three-wire synchronous communication. (shared with IO)
Programmable Tone Generators
Operation Voltage 2.2V5.5V
Programmable Tone1 and Tone2 generators
Independent single tone generation for Tone1 and Tone2
Mixed dual tone generation by Tone1 and Tone2 with 2dB difference
LCD (8x80, 9x80, 16x80, 24x72)
Maximum common driver pins : 16/24
Maximum segment driver pins : 80(SEG0..SEG79)/72(SEG8..SEG79)
Shared COM16 ~ COM23 pins with SEG0 ~ SEG7 pins
1/4 bias for 8, 9 and 16 common mode and 1/5 bias for 24 common mode
1/8, 1/9, 1/16, 1/24 duty
16 Level LCD contrast control (software)
Internal resistor circuit for LCD bias
Internal voltage follower for better display
Package type
128-pin QFP or chip : EM78870AQ (POVD disable), EM78870BQ (POVD enable), EM78870H
EM78870
8-bit Micro-controller
_________________________________________________________________________________________________________________________________________________________________
* This specification are subject to be changed without notice.
2
2001/08/29
III.Application
Cordless phones or any telephone product with large LCD needed
IV.Pin Configuration
Fig.1 Pin assignment (128-pin QFP or chip)
COM9
COM8
COM7
COM6
COM5
COM4
COM3
COM2
COM1
COM0
VC4
VC3
VC2
VC1
VDD
XIN
XOUT
PLLC
TONE
AVSS
GND
/RESET
P70/INT0
P71/INT0
P72/INT0
P73/INT0
P74/INT1
P75/INT1
P76/INT1
P77/INT2
P60/SCK
P61/SDO
P62/SDI
P63/CMP1
P64/CMP2
P66
P55
P56
P57
SEG79/P97
SEG78/P96
SEG77/P95
SEG76/P94
SEG75/P93
SEG74/P92
SEG73/P91
SEG72/P90
SEG71/P87
SEG70/P86
SEG69/P85
SEG68/P84
SEG67/P83
SEG66/P82
SEG65/P81
SEG64/P80
SEG63/PC7
SEG62/PC6
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
SEG40
SEG41
SEG42
SEG43
SEG44
SEG45
SEG46
SEG47
SEG48/PB0
SEG49/PB1
SEG50/PB2
SEG51/PB3
SEG52/PB4
SEG53/PB5
SEG54/PB6
SEG55/PB7
SEG56/PC0
SEG57/PC1
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
COM23/SEG7
COM22/SEG6
COM21/SEG5
COM20/SEG4
COM19/SEG3
COM18/SEG2
COM17/SEG1
COM16/SEG0
COM15
COM14
COM13
COM12
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
20
21
22
23
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
104
103
102
101
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
88
83
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
110
111
112
123
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
VC5
AVDD
19
TEST
24
SEG58/PC2
67
P67/KTONE
P65/CMP3
66
SEG18
SEG19
COM11
COM10
107
108
SEG17
109
SEG61/PC5
SEG60/PC4
SEG59/PC3
42
43
18
21
40
41
65
64
105
106
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