EM78P159N
8-Bit Microcontroller with OTP ROM
3.3
Symbol
VDD
P56/OSCI
EM78P159NKM Pin Description
Pin No.
15,16
18
Type
-
I/O
■
Power supply.
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
General-purpose I/O pin
XTAL type: Crystal input terminal or external clock input pin.
ERC type: RC oscillator input pin.
General-purpose I/O pin
XTAL type: Output terminal for crystal oscillator or external clock input pin
RC type: Instruction clock output
External clock signal input
General-purpose I/O pin
The real time clock/counter (with Schmitt trigger input pin), must be tied to
VDD or VSS if not in use.
Input pin with Schmitt trigger. If this pin remains at logic low, the controller
will also remain in reset condition.
P50 ~ P53 are bi-directional I/O pins.
P50 and P51 can also be defined as the R-option pins.
P50 ~ P53 can be pulled-down by software.
P60 ~ P67 are bi-directional I/O pins.
These can be pulled-high or can be open-drain by software programming.
P60 ~ P63 can also be pulled-down by software
Function
P55/OSCO
17
I/O
P54/TCC
/RESET
P50~P53
3
4
19, 20,
1, 2
7~14
7
5, 6
I/O
I
I/O
P60~P67
/INT
VSS
I/O
I
-
■
External interrupt pin triggered by falling edge
■
Ground
Product Specification (V1.0) 03.10.2006
(This specification is subject to change without further notice)
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5
EMC [ ELAN MICROELECTRONICS CORP ]
