Version History

Specification Revision History

Version Content

eFH785840

1.0 Initial

version

1.1

1. Remove Crystal mode's Idle application
2. Modify operating temperature

1.2

1. Rename

EM78785840/41/42 EM785840/41/42

2. Change IRC frequency deviation from +/- 5% to +/- 10%

Relative to EM785840s ROM-less, OTP and mask:

ROM-less OTP

Mask

ICE5830

EM78P5840
EM78P5841
EM78P5842

EM785840
EM785841
EM785842

Table1: the relation between EM785830 and EM785840 series:

EM785830 series

EM78P5840 series

PACKAGE

EM785830ACP

EM78P840P

18 pin PDIP

EM785830ACM

EM785840M

18 pin SOP

EM785830ABP

EM785841P

20 pin PDIP

EM785830ABM

EM785841M

20 pin SOP

EM785830AFP

EM785842P

24 pin PDIP

EM785830AFM

EM785842M

24 pin SOP

Table2: the major differences between EM78P5830 and EM78P5840 series:

EM785830 series

EM785840 series

CID RAM

256 byte

ERIC mode

Under 6M Hz

IRC mode

2M / 4M Hz

WDT source

Crystal or PLL

IRC1

External CNT1 input

Shared with P94

P71 pull high

Internal pull high

External pull high

/RESET pin

/RESET only

Shared with P71

PLLC pin

PLLC only

Shared with P70 and ERCI

XIN, XOUT

Crystal input

Shared with P60 and P61

Table3: the major differences between ICE5840, EM78P5840 and EM785840:

ICE5840

EM78P5840

series

EM785840

series

CID RAM

1024 byte

CID RAM address auto

V NA NA

CNT1(**)

8 bit counter

8 or 16 (shared with

CNT2) bit counter

CNT2(**) V

STACK 12

** CNT2 is only exist on EM78P5840/41/42 and EM785840/41/42, CNT2 is un-support on ICE5840.

EM785840/5841/5842

8-bit Micro-controller

__________________________________________________________________________________________________________________________________________________________________

* This specification is subject to change without notice.

2004/11/10 V1.2

Table4: Differences between EM78P5840, EM78P5841 and EM78P5842:

EM78P5840

EM78P5841

EM78P5842

Pin count

PWM

2 channel

IO (MAX)

User Application Note

(Before using this chip, take a look at the following description note, it includes important messages.)

1. There are some undefined bits in the registers. The values in these bits are unpredicted. These

bits are not allowed to use. We use the symbol "-" in the spec to recognize them. A fixed value
must be write in some specific unused bits by software or some unpredicted wrong will occur.

2. You will see some names for the register bits definitions. Some name will be appear very

frequently in the whole spec. The following describes the meaning for the register's definitions
such as bit type, bit name, bit number and so on.

RAB7

RAB6

BAB5

RAB4

RAB2

RAB0

R/W-0

R-1

R/W-1

R/W

Bit type

Bit name

Bit number

read/write

(default value=0)

read/write

(default value=1)

read only

(w/o default value)

read/write

(w/o default value)

PAGE0

RAB1

(undefined) not allowed to use

R-0

read only

(default value=0)

read only

(default value=1)

3. Please do not switch MCU operation mode from normal mode to sleep mode directly. Before

into sleep mode, please switch MCU to green mode.

4. While switching main clock (regardless of high freq to low freq or on the other hand), adding 6

instructions delay (NOP) is required.

5. Offset voltage will effect ADC's result, please refer to figure 16 to detail.

EM785840/5841/5842

8-bit Micro-controller

__________________________________________________________________________________________________________________________________________________________________

* This specification is subject to change without notice.

2004/11/10 V1.2

I. General Description

The EM785840 series are 8-bit RISC type microprocessor with low power, high speed CMOS technology. There

are 4Kx13 bits ROM within it. This integrated single chip has an on_chip watchdog timer (WDT), RAM, programmable
real time clock/counter, internal interrupt, power down mode, dual PWM (Pulse Width Modulation), 8-channel 10-bit
A/D converter and tri-state I/O.

II. Feature

CPU

�

Operating voltage : 2.2V~5.5V at main CLK less then 3.58MHz.

Main CLK(Hz)

Under 3.58M

14.3M

Operating Voltage(min)

2.2V

3.6V

�

4k x 13 on chip mask ROM

�

144 x 8 on chip general propose RAM

�

Up to 21 bi-directional and 1 input only general purpose I/O (For 24 pin package)

�

8 level stack for subroutine nesting

�

8-bit real time clock/counter (TCC)

�

One 8-bit counter interrupt

�

On-chip watchdog timer (WDT)

�

99.9 single instruction cycle commands

�

Four action modes in Crystal mode (Main clock can be programmed to 3.58M or 14.3M Hz)

Mode

CPU status

Main clock

32.768kHz clock status

Sleep mode

Turn off

Green mode

Turn on

Turn off

Turn on

Normal mode

Turn on

�

2 level Normal mode frequency: 3.58M and 14.3MHz.

�

Input port interrupt function

�

Dual clocks operation (Internal PLL main clock , External 32.768KHz)

Operating frequency mode

�

Crystal mode (XIN,XOUT pin connect external crystal and capacitance)

�

ERIC mode (ERCI pin connect resister to VDD)

�

IRC mode

PWM

�

Dual PWM (Pulse Width Modulation) with 10-bit resolution

�

Programmable period (or baud rate)

�

Programmable duty cycle

ADC

�

Operating : 2.5V5.5V

Converter Rate

74.6K

37.4K

18.7K

9.3K

Operating Voltage(min)

3.5V

3.0V

2.5V

�

8 channel 10-bit successive approximation A/D converter

�

Internal (VDD) reference voltage

POR

�

Power-on reset

PACKAGE

EM785840M 18 pin SOP, EM785841M 20 pin SOP, EM785842M 24 pin SOP
EM785840P 18 pin PDIP, EM785841P 20 pin PDIP, EM785842P 24 pin PDIP

EM785840/5841/5842

8-bit Micro-controller

__________________________________________________________________________________________________________________________________________________________________

* This specification is subject to change without notice.

2004/11/10 V1.2

III. Application

General products application.

IV. Pin Configuration

(a)

(b) (c)

Fig.1: EM785840 series pin assignment.

(a): EM785840M, EM785840P
(b): EM785841M, EM785841P
(c):

EM785842M,

EM785842P

P96

P95

CIN/P94

AD7/P92

AD2/P91

AD1/P90

AD8/P93

AVSS

AD3/P62

AD6/P65

AD5/P64

AD4/P63

XIN/P61

XOUT/P60

/RESET/P71/INT1

INT3/P73

AVDD

PLLC/ERIC

/P70/INT0

P96

P95

CIN/P94

AD7/P92

AD2/P91

AD1/P90

AD8/P93

AVSS

AD3/P62

AD6/P65

AD5/P64

AD4/P63

INT3/P73

AVDD

PWM2/PC2

PWM1/PC1

XIN/P61

XOUT/P60

/RESET/P71/INT1

PLLC/ERIC

/P70/INT0

P95

CIN/P94

AD7/P92

AD2/P91

AD1/P90

AD8/P93

AVSS

AD3/P62

AD6/P65

AD5/P64

AD4/P63

INT3/P73

AVDD

PWM2/PC2

PWM1/PC1

P96

P74

P75

P76

P97

XIN/P61

XOUT/P60

/RESET/P71/INT1

PLLC/ERIC

/P70/INT0

Электронный компонент: EM785841M