em78p156n ELAN Microelectronics Corp, em78p156n Datasheet - Page 6

• Manufacturer Part Number: em78p156n
• Description: 8-bit Micro-controller
• Manufacturer: ELAN Microelectronics Corp

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