EM78P156N
OTP ROM
Table 2 EM78P156NAS Pin Description
Symbol Pin No.
Type
-
Function
VDD
15
* Power supply.
* XTAL type: Crystal input terminal or external clock input pin.
* ERC type: RC oscillator input pin.
OSCI
17
I
* XTAL type: Output terminal for crystal oscillator or external clock input pin.
* RC type: Instruction clock output.
OSCO
16
I/O
* 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.
* Input pin with Schmitt trigger. If this pin remains at logic low, the controller
will also remain in reset condition.
TCC
4
5
I
I
/RESET
* P50~P53 are bi-directional I/O pins.
* P50 and P51 can also be defined as the R-option pins.
* P50~P52 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.
18, 19,
2, 3
P50~P53
I/O
I/O
P60~P67 7~14
/INT
VSS
7
6
I
-
* External interrupt pin triggered by falling edge.
* Ground.
Table 3 EM78P156NKM Pin Description
Symbol Pin No.
Type
-
Function
VDD
15,16
* Power supply.
* XTAL type: Crystal input terminal or external clock input pin.
* ERC type: RC oscillator input pin.
OSCI
18
I
* XTAL type: Output terminal for crystal oscillator or external clock input pin.
* RC type: Instruction clock output.
OSCO
17
I/O
* 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.
* Input pin with Schmitt trigger. If this pin remains at logic low, the controller
will also remain in reset condition.
TCC
3
4
I
I
/RESET
* P50~P53 are bi-directional I/O pins.
* P50 and P51 can also be defined as the R-option pins.
* P50~P52 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.
19, 20,
1, 2
P50~P53
I/O
I/O
P60~P67 7~14
/INT
VSS
7
5, 6
I
-
* External interrupt pin triggered by falling edge.
* Ground.
This specification is subject to change without prior notice.
7
07.29.2004 (V1.2)
ELAN [ ELAN MICROELECTRONICS CORP ]
