ELANsat Tech OTP ROM EM78P156N - Manual (Page 7)

EM78P156N
OTP ROM
Table 2 EM78P156NAS Pin Description
Symbol Pin No. Type Function
VDD 15 - * Power supply.
OSCI 17 I
* XTAL type: Crystal input terminal or external clock input pin.
* ERC type: RC oscillator input pin.
OSCO 16 I/O
* XTAL type: Output terminal for crystal oscillator or external clock input pin.
* RC type: Instruction clock output.
* External clock signal input.
TCC 4 I
* The real time clock/counter (with Schmitt trigger input pin), must be tied to
VDD or VSS if not in use.
/RESET 5 I
* Input pin with Schmitt trigger. If this pin remains at logic low, the controller
will also remain in reset condition.
P50~P53
18, 19,
2, 3
I/O
* 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 7~14 I/O
* 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.
/INT 7 I * External interrupt pin triggered by falling edge.
VSS 6 - * Ground.
Table 3 EM78P156NKM Pin Description
Symbol Pin No. Type Function
VDD 15,16 - * Power supply.
OSCI 18 I
* XTAL type: Crystal input terminal or external clock input pin.
* ERC type: RC oscillator input pin.
OSCO 17 I/O
* XTAL type: Output terminal for crystal oscillator or external clock input pin.
* RC type: Instruction clock output.
* External clock signal input.
TCC 3 I
* The real time clock/counter (with Schmitt trigger input pin), must be tied to
VDD or VSS if not in use.
/RESET 4 I
* Input pin with Schmitt trigger. If this pin remains at logic low, the controller
will also remain in reset condition.
P50~P53
19, 20,
1, 2
I/O
* 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 7~14 I/O
* 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.
/INT 7 I * External interrupt pin triggered by falling edge.
VSS 5, 6 - * Ground.
This specification is subject to change without prior notice. 7 07.29.2004 (V1.2)
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