Block Diagram; Pin Assignment - Holtek HT48RA5 Technical Document

Block Diagram

P r o g r a m
P r o g r a m
C o u n t e r
R O M
B P
I n s t r u c t i o n
R e g i s t e r
I n s t r u c t i o n
D e c o d e r
T i m i n g
G e n e r a t o r
O S C 2 O S C 1
R E S
V D D
V S S

Pin Assignment

Rev. 1.40
P F 0 / I N T
I n t e r r u p t
C i r c u i t
S T A C K
I N T C
M
D A T A
M P
U
M e m o r y
X
M U X
S T A T U S
A L U
S h i f t e r
A C C
P B 5
1
P B 4 2
P A 3 3
P A 2 4
P A 1 5
P A 0 6
P B 3
7
P B 2
8
P B 1
9
P B 0 / P F D 1 0
V S S 1 1
P F 0 / I N T 1 2
P C 0 / T M R 0 1 3
P C 1 1 4
H T 4 8 R A 5 / H T 4 8 C A 5
2 8 S O P - A / S S O P - A
2
HT48RA5/HT48CA5
T M R 1 C
M
U
X
T M R 1
M
U
T M R 0
X
T M R 0 C
E N / D I S
W D T S
W D T
W D T P r e s c a l e r
P A C
P O R T A
P A 0 ~ P A 7
P A
P F D
P B C
P O R T B
P B 0 / P F D
P B P B 1 ~ P B 7
P C 0 / T M R 0
P C C
P O R T C
P C 1 ~ P C 4
P C P C 5 / T M R 1
P F C
P O R T F
P F 0 / I N T
P F
P B 6
2 8
P B 7
2 7
P A 4
2 6
P A 5
2 5
2 4 P A 6
2 3 P A 7
O S C 2
2 2
O S C 1
2 1
V D D
2 0
R E S
1 9
P C 5 / T M R 1
1 8
1 7 P C 4
1 6 P C 3
P C 2
1 5
f / 4
S Y S
P C 5 / T M R 1
P r e s c a l e r
f
S Y S
P C 0 / T M R 0
M
f / 4
S Y S
U
X
W D T O S C
May 22, 2009