Filter
Top Products
EM78P221/2N
8-Bit Microcontroller with OTP ROM
4 •
Product Specification (V1.0) 10.19.2007
(This specification is subject to change without further notice)
4 Pin Description
4.1 EM78P222N
Symbol Pin No. Type Function
P50~P57
1~2
11~12
17~18
26~27
I/O
8-bit General purpose input/output pins
Default value at power-on reset
P60~P67
6 ~ 10
19 ~21
I/O
8-bit General purpose input/output pins
Default value at power-on reset
P70~ P77
5
14 ~ 16
22~25
I/O
8-bit General purpose input/output pins
Default value at power-on reset.
P72 and P73 are open drain pins when used as output pins in
ICE220N simulator.
P80, P81
13, 28 I/O
2-bit General purpose input or output pin
Default value at power-on reset
P81 is define as General purpose input or output open-drain
pin.
CIN-
CIN+
CO
22
23
24
I
I
O
“-“ : input pin of Vin- of the comparator
“+” : input pin of Vin+ of the comparator
Pin CO is the comparator output
Defined by CMPCON (Bank 1-RA) <3 : 4>
OSCI
27 I
Crystal type: Crystal input terminal
RC type: RC oscillator input pin
OSCO
26 O
Crystal type: Output terminal for crystal oscillator.
RC type: Clock output with a duration of one instruction cycle
time.
External clock signal input.
/RESET
28 I
If it remains at a logic low, the device will be reset
Wake-up from sleep mode when pin status changes
Voltage on /RESET must not exceed Vdd during normal mode
INT0~INT1
5, 24 I
External interrupt pin
VDD
3 -
Power supply
VSS
4 -
Ground