EM78P447S
OTP ROM
Table 2 EM78P447SAS Pin Description
Symbol Pin No.
Type
-
Function
VDD
3
* Power supply.
* XTAL type: Crystal input terminal or external clock input pin.
* RC type: RC oscillator input pin.
* XTAL type: Output terminal for crystal oscillator or external clock input pin.
* RC type: Instruction clock output.
OSCI
27
I
I/O
I
OSCO
26
* 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.
TCC
2
* Input pin with Schmitt trigger. If this pin remains at logic low, the controller
will also remain in reset condition.
/RESET
28
I
P50~P53 5~8
I/O
I/O
* P50~P53 are bi-directional I/O pins.
9~13,
* P60~P67 are bi-directional I/O pins. These can be pulled -high internally
by software control.
P60~P67
15~17
* P70~P77 are bi-directional I/O pins.
* P74~P75 can be pulled -high internally by software control.
* P76~P77 can have open-drain output by software control.
* P70 and P71 can also be defined as the R-option pins.
* External interrupt pin triggered by falling edge.
* Ground.
P70~P77 18~25
I/O
/INT
VSS
4
1,14
I
-
Table 3 EM78P447SBP and EM78P447SBWM Pin Description
Symbol Pin No.
Type
-
Function
VDD
4
* Power supply.
* XTAL type: Crystal input terminal or external clock input pin.
* RC type: RC oscillator input pin.
OSCI
29
I
* XTAL type: Output terminal for crystal oscillator or external clock input
pin.
OSCO
28
I/O
* 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 keep in reset condition.
TCC
3
I
/RESET
P50~P57
30
I
8~11,2~1,
32~31
I/O
I/O
* P50~P57 are bi-directional I/O pins.
* P60~P67 are bi-directional I/O pins. These can be pulled -high internally
by software control.
* P70~P77 are bi-directional I/O pins.
P60~P67 12~19
* P74~P75 can be pulled-high internally by software control.
* P76~P77 can have open-drain output by software control.
* P70 and P71 can also be defined as the R-option pins.
* External interrupt pin triggered by falling edge.
* Ground.
P70~P77 20~27
I/O
/INT
VSS
NC
7
6
5
I
-
-
* No connection.
This specification is subject to change without prior notice.
7
06.25.2003 (V1.1)
ELAN [ ELAN MICROELECTRONICS CORP ]
