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EM78P221/2N
8-Bit Microcontroller with OTP ROM
Product Specification (V1.0) 10.19.2007 5
(This specification is subject to change without further notice)
4.2 EM78P221N
Symbol Pin No. Type Function
P50~P57
1~2
11~14
22~23
I/O
8-bit General purpose input/output pins
Default value at power-on reset.
P60~P67
6 ~ 10
15~17
I/O
8-bit General purpose input/output pins
Default value at power-on reset
P70~P73
P77
5
21 ~ 18
I/O
5-bit General purpose input/output pins
Default value at power-on reset
P72 and P73 are open drain pins when used as output pins of
the ICE220N simulator.
P81
24 I/O
1-bit General purpose input or output open-drain pin
Default value at power-on reset
CIN-
CIN+
CO
18
19
20
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
23 I
Crystal type: Crystal input terminal
RC type: RC oscillator input pin
OSCO
22 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
24 I
If it remains at 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, 20 I
External interrupt pin
VDD
3 -
Power supply
VSS
4 -
Ground