EM78156E
8-Bit Microcontroller with MASK ROM
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ꢀ
2 programmable R-option pins
Package types:
• 18 pin DIP 300mil : EM78156EP
• 18 pin SOP(SOIC) 300mil : EM78156EM
• 20 pin SSOP 209mil : EM78156EAS
• 20 pin SSOP 209mil : EM78156EKM
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ꢀ
99.9% single instruction cycle commands
The transient point of system frequency between HXT and LXT is around 400KHz
3 PIN ASSIGNMENT
NC
20
19
18
17
16
15
14
13
12
11
NC
1
2
20
19
18
17
16
15
14
13
12
11
P52
1
2
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
P50
P53
TCC
3
P50
P53
TCC
3
OSCI
OSCO
VDD
VDD
OSCI
OSCO
VDD
OSCI
OSCO
VDD
4
4
/RESET
Vss
/RESET
Vss
/RESET
Vss
5
5
6
Vss
6
P60/INT
P61
P67
P66
P65
P64
P60/INT
P61
7
P60/INT
P61
7
P67
P66
P65
P64
P67
P66
P65
P64
8
8
P62
P62
9
P62
9
P63
P63
10
P63
10
Fig. 1 Pin Assignment
Table 1 EM78156EP and EM78156EM Pin Description
Symbol Pin No.
Type
Function
VDD
14
16
-
■ Power supply.
■ XTAL type: Crystal input terminal or external clock input pin.
■ ERC type: RC oscillator input pin.
OSCI
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.
■ 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.
17, 18,
1, 2
P50~P53
I/O
I/O
P60~P67 6~13
/INT
VSS
6
5
I
■ External interrupt pin triggered by falling edge.
■ Ground.
-
2 •
Product Specification (V1.3) 07.29.2004
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
