EM78F651N
8-Bit Microcontroller
Table 3 EM78F651NCP, EM78F651NCM
Symbol
Pin No.
Type
Function
P50~P53
P54~P55
P50~P53 are bidirectional 4-bit input/output pins and can be pulled-
down by software.
17, 18, 1
2, 15, 16
I/O
Bidirectional 8-bit input/output pins. These can be pulled-high or can
be open drain by software programming. P60~63 can also be pulled
down by software.
6~13
I/O
P60~P67
3
I/O
I
P77
P77 is an open drain I/O pin.
Crystal type: Crystal input terminal or external clock input pin
ERC type: RC oscillator input pin
16
OSCI
Crystal type: Output terminal for crystal oscillator or external clock
input pin.
RC type: Instruction clock output.
15
I/O
OSCO
External clock signal input.
Real time clock/counter (with Schmitt Trigger input pin) must be tied to
VDD or VSS if not in use.
3
6
4
I
I
I
TCC
/INT
External interrupt pin triggered by a falling edge.
Input pin with Schmitt Trigger. If this pin remains at logic low, the
controller will also remain in reset condition.
/RESET
14
5
-
-
VDD
VSS
Power supply
Ground
Table 4 EM78F651NDKM, EM78F651NDP
Symbol
Pin No.
Type
Function
P50~P57 are bidirectional 8-it input/output pins.
P50 and P51 can also be defined as the R-option pins.
P50~P53 can be pulled-down by software.
18, 19, 2,
3, 16, 17,
1, 20
I/O
P50~P57
Bidirectional 8-bit input/output pins. These can be pulled-high or can
be open drain by software programming. P60~63 can also be pulled
down by software.
7~14
I/O
P60~P67
4
I/O
I
P77
P77 is an open drain I/O pin.
Crystal type: Crystal input terminal or external clock input pin
ERC type: RC oscillator input pin
17
OSCI
Crystal type: Output terminal for crystal oscillator or external clock
input pin.
RC type: Instruction clock output.
16
I/O
OSCO
External clock signal input.
The real time clock/counter (with Schmitt Trigger input pin) must be
tied to VDD or VSS if not in use.
4
7
5
I
I
I
TCC
/INT
External interrupt pin triggered by a falling edge.
Input pin with Schmitt Trigger. If this pin remains at logic low, the
controller will also remain in reset condition.
/RESET
15
5
-
-
VDD
VSS
Power supply
Ground
4 •
Product Specification (V1.1) 10.20.2006
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
