Holtek HT48R70A-1 - Chapter 3 Instruction Definition; Arithmetic and Data Manipulation Instructions

No. Option
12 LVR function: enable or disable
13
External RC system clock/External Crystal System Clock/Internal RC system clock plus RTC clock/Internal
RC system plus I/O (last option not applicable to HT48R70A-1/HT48C70-1 and HT48RU80/HT48CU80)
14 Internal RC frequency selection 3.2MHz, 1.6MHz, 800kHz or 400kHz.
Application Circuits
The following application circuits although based around the HT48R50A-1 device equally apply to
all devices in the I/O type range.
90
I/O Type MCU
P A 0 ~ P A 7
P B 2 ~ P B 7
P C 0 ~ P C 7
P D 0 ~ P D 7
P B 0 / B Z
P B 1 / B Z
T M R 0
T M R 1
O S C 1
O S C 2
O S C
C i r c u i t
R E S
0 . 1
m
F
1 0 0 k
W
V D D
V S S
0 . 1
m
F
V
D D
0 . 0 1
m
F
1 0 k
W
P G 0 / I N T
H T 4 8 R 5 0 A - 1 / H T 4 8 C 5 0 - 1
S e e B e l o w
O S C C i r c u i t
R C S y s t e m O s c i l l a t o r
2 4 k
W
< R
O S C
< 1 M
W
O S C 1
O S C 2
C r y s t a l S y s t e m O s c i l l a t o r
F o r c o m p o n e n t v a l u e s ,
c o n s u l t O s c i l l a t o r s e c t i o n
R 1
C 1
C 2
V
D D
R
O S C
O S C 1
O S C 2
4 7 0 p F
N M O S o p e n d r a i n
O S C 1
O S C 2
I n t e r n a l R C O s c i l l a t o r
O S C 1 a n d O S C 2 l e f t
u n c o n n e c t e d
I n t e r n a l R C O s c i l l a t o r
w i t h R T C
O S C 1
O S C 2
R 1
C 1
C 2
3 2 7 6 8 H z