em78p257 ELAN Microelectronics Corp, em78p257 Datasheet - Page 8

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

This specification is subject to change without prior notice.
Table 3 Pin Description-EM78P257BP/BM/BKM
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
Symbol
P61/CIN3-/TCC1
P54/CIN2-/TCC
Pin No.
18,19
13,12
10,11
20,19
20,1
8,13
P71//RESET
3,2
8,9
5,6
14
15
17
16
7
3
4
P53/CIN2+
P62/CIN3+
P56/TCC5
P63/CO3
P52/CO2
P60//INT
Type
I/O * XTAL type: output terminal for crystal oscillator or external clock
O
O
O
-
-
I
I
I
I
I
I
I
I
Vss
* 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.
Power supply.
* XTAL type: Crystal input terminal or external clock input pin.
* RC type: RC oscillator input pin.
input pin.
Fig. 2 Pin Assignment - EM78P257BP/BM
10
6
1
2
3
4
5
7
8
9
8
19
15
14
13
12
20
18
17
16
11
Function
P57/TCC6
P50/CIN1+/TCC4
P70/OSCO
VDD
P51/CO1/TCC3
P55/CIN1-/OSCI
P65/CIN4+
P64/CO4
P67/IR OUT
P66/CIN4-/TCC2
EM78P257
07.27.2004 (V1.4)
OTP ROM