EM78P157N
8-Bit Microcontroller with OTP ROM
Programmable free running watchdog timer
8 programmable pull-high pins
7 programmable pull-down pins
8 programmable open-drain pins
2 programmable R-option pins
Package types:
• 14 pin DIP
300mil : EM78P157NBP
• 14 pin SOP 150mil : EM78P157NBM
• 18 pin DIP
300mil : EM78P157NAP
• 18 pin SOP 300mil : EM78P157NAM
• 20 pin SSOP 209mil : EM78P157NAAS
• 20 pin SSOP 209mil : EM78P157NAKM
99.9% single instruction cycle commands
The transient point of system frequency between HXT and LXT is around 400KHz
3 Pin Assignments and Descriptions
3.1 Pin Assignments
P52
18
17
16
15
14
13
12
11
10
P51
1
2
3
4
5
6
7
8
9
P50
P53
TCC
OSCI
OSCO
VDD
1
2
3
4
5
6
7
14
13
12
11
10
9
P51
P52
P53
/RESET
Vss
P50
TCC
/RESET
Vss
OSCI
P60/INT
P61
OSCO
VDD
P67
P67
P66
P65
P64
P60/INT
P61
P62
8
P66
P63
NC
20
19
18
17
16
15
14
13
12
11
NC
1
2
20
P52
1
2
P51
P52
P51
19
18
17
16
15
14
13
12
11
P50
P53
TCC
/RESET
Vss
3
P50
P53
TCC
3
OSCI
OSCO
VDD
VDD
OSCI
OSCO
VDD
4
4
/RESET
Vss
5
5
6
Vss
6
P60/INT
P61
7
P67
P66
P65
P64
P60/INT
P61
7
P67
P66
P65
P64
8
8
P62
9
P62
9
P63
10
P63
10
Fig. 1-1 Pin Assignments
2 •
Product Specification (V1.0) 09.22.2005
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
