EM78P156N
OTP ROM
3. PIN ASSIGNMENTS
NC
20
19
18
17
16
15
14
13
12
11
NC
1
2
1
2
20
19
18
17
16
15
14
13
12
11
P52
P51
P52
18
17
16
15
14
13
12
11
10
P51
1
2
3
4
5
6
7
8
9
P52
P51
P50
P53
TCC
/RESET
Vss
P50
P53
TCC
3
P50
P53
TCC
3
OSCI
OSCO
VDD
VDD
OSCI
OSCO
VDD
4
OSCI
OSCO
VDD
4
/RESET
Vss
/RESET
Vss
5
5
6
Vss
6
P60/INT
P61
P67
P66
P65
P64
P60/INT
P61
7
P67
P66
P65
P64
P60/INT
P61
7
P67
P66
P65
P64
8
8
P62
P62
9
P62
9
P63
P63
10
P63
10
Fig. 1 Pin Assignment
Table 1 EM78P156NP and EM78P156NM Pin Description
Symbol Pin No.
Type
-
Function
VDD
14
* Power supply.
* XTAL type: Crystal input terminal or external clock input pin.
* ERC type: RC oscillator input pin.
OSCI
16
I
* XTAL type: Output terminal for crystal oscillator or external clock input pin.
* RC type: Instruction clock output.
OSCO
15
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.
17,18,
1, 2
P50~P53
I/O
I/O
* 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.
* External interrupt pin triggered by falling edge.
* Ground.
P60~P67 6~13
/INT
VSS
6
5
I
-
This specification is subject to change without prior notice.
6
07.29.2004 (V1.2)