em78p257 ELAN Microelectronics Corp, em78p257 Datasheet - Page 7

• Manufacturer Part Number: em78p257
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

This specification is subject to change without prior notice.
Table 1 Pin Description- EM78P257AP/AM
Table 2 Pin Description- EM78P257AKM
VDD
OSCI
OSCO
P70~P71
P60~P67
P50~P55
IR OUT
/INT
CIN1-,CIN1+
CIN2-,CIN2+
CIN3-,CIN3+
CIN4-,CIN4+
CO1,CO2
CO3,CO4
TCC
TCC1,TCC2,
TCC3,TCC4
/RESET
VSS
VDD
OSCI
OSCO
P70,P71
P60~P67
P50~P55
Symbol
Symbol
Pin No.
16~18
16,17
12,11
18,17
Pin No.
6~13
,7,12
4,15
18,1
9,10
18~20
1~3
15,16
3,2
7,8
7~14
14
16
15
13
17,4
1~3
6
3
4
5
18
17
Type
Type
I/O * XTAL type: output terminal for crystal oscillator or external clock
I/O * General purpose I/O pin. (P71 is input pin only)
I/O * General purpose I/O pin.
I/O * General purpose I/O pin.
I/O
I/O
I/O
I/O
-
O
O
O
I
-
I
I
I
I
I
I
I
I
-
Power supply.
* XTAL type: Crystal input terminal or external clock input pin.
* RC type: RC oscillator input pin.
input pin.
* RC type: clock output with a duration of one instruction cycle.
* External clock signal input.
* Default value after a power on reset.
* Open_drain.
* Default value after a power on reset.
* Pull_high/pull_down.
Power supply.
* XTAL type: Crystal input terminal or external clock input pin.
* RC type: RC oscillator input pin.
* XTAL type: output terminal for crystal oscillator or external clock
input pin.
* RC type: clock output with a duration of one instruction cycle.
* External clock signal input.
* General purpose I/O pin. (P71 is input pin only)
* Default value after a power on reset.
* General purpose I/O pin.
* Open_drain
* Default value after a power on reset.
* General purpose I/O pin.
* Pull_high/pull_down.
* Wake up from sleep mode when the status of the pin changes.
* Default value after a power on reset.
* IR mode output pin, capable of sinking 20mA
* External interrupt pin triggered by falling edge.
* “-“ -> the input pin of Vin- of a comparator.
* “+”-> the input pin of Vin+ of a comparator.
* Pin CO1~4 are the outputs of the comparators.
* External Counter input.
* If set as /RESET and remains at logic low, the device will be reset.
* Voltage on /RESET/Vpp must not exceed Vdd during the normal
mode.
* Pull_high is on if defined as /RESET.
Ground.
7
Function
Function
EM78P257
07.27.2004 (V1.4)
OTP ROM