EM78P447N
8-Bit Microcontroller with OTP ROM
6
•
Product Specification (V1.1) 03.30.2005
(This specification is subject to change without further notice)
Table 5 EM78P447NDK and EM78P447NDM Pin Description
Symbol
Pin No.
Type
Function
VDD 3 -
■
Power supply.
OSCI 19 I
■
XTAL type: Crystal input terminal or external clock input pin.
■
RC type: RC oscillator input pin.
OSCO 18 I/O
■
XTAL type: Output terminal for crystal oscillator or external clock input pin.
■
RC type: Instruction clock output.
■
External clock signal input.
TCC 2 I
■
The real time clock/counter (with Schmitt trigger input pin) must be tied to
VDD or VSS if not in use.
/RESET 20
I
■
Input pin with Schmitt trigger. If this pin remains at logic low, the controller
will also remain in reset condition.
P50~P54 6~9,1
I/O
■
P50~P54 are bi-directional I/O pins.
P60 10
I/O
■
P60 are bi-directional I/O pins. This can be pulled-high internally by
software
control.
P71~P77 11~17
I/O
■
P74~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.
■
P71 can also be defined as the R-option pins.
/INT 5 I
■
External interrupt pin triggered by falling edge.
VSS 4 -
■
Ground.
NC 3
-
■
No connection.
4 FUNCTION
DESCRIPTION
IO C 5
R 5
P
5
0
P
5
1
P
5
2
P
5
3
P
5
4
P
5
5
P
5
6
P
5
7
IO C 6
R6
IO C 7
R 7
A C C
R 3
S T A C K 1
S T A C K 2
S T A C K 3
S T A C K 4
S T A C K 5
P C
R O M
In s tru c tio n
R e g is te r
In s tru c tio n
D e c o d e r
A L U
In te rru p t
C o n tro l
R 4
R A M
W D T T im e r
P re s c a le
r
O s c illa to r/T im in g
C o n tro l
W D T
T im e
- o u t
R 1 (T C C )
S le e p
&
W a k e
C o n tro l
D A T A & C O N T R O L B U S
/IN T
T C C
O S C I
O S C O
/R E S E T
P
6
0
P
6
1
P
6
2
P
6
3
P
6
4
P
6
5
P
6
6
P
6
7
P
7
0
P
7
1
P
7
2
P
7
3
P
7
4
P
7
5
P
7
6
P
7
7
Fig. 2 Functional Block Diagram
