Block Diagram
The following block diagram illustrates the main functional blocks of the I/O Type microcontroller
series of devices.
Note
1. This block diagram represents the OTP device, for the mask device there is no Device
Programming Circuitry.
2. The UART only exists in the HT48RU80/HT48CU80.
6
I/O Type MCU
T i m i n g
G e n e r a t o r
S y s t e m R C /
X ' t a l O s c i l l a t o r
I n s t r u c t i o n
D e c o d e r
I n s t r u c t i o n
R e g i s t e r
W D T
O s c i l l a t o r
D a t a
M e m o r y
A d d r e s s D e c o d e r
M e m o r y
P o i n t e r
M U X
A C C
L o o k - u p
T a b l e
R e g i s t e r
C o n f i g .
R e g i s t e r
W a t c h d o g
T i m e r
R e s e t &
L V R
C o n f i g .
R e g i s t e r
T i m e r ( s ) /
C o u n t e r
B u z z e r
D r i v e r
C o n f i g .
R e g i s t e r
I n t e r r u p t
C i r c u i t
C o n f i g .
R e g i s t e r
I / O
P o r t s
D e v i c e
P r o g r a m m i n g
C i r c u i t r y
C o n f i g u r a t i o n
O p t i o n
P r o g r a m
M e m o r y
A d d r e s s D e c o d e r
S t a c k
S t a c k P o i n t e r
P r o g r a m
C o u n t e r
L o o k - u p
T a b l e
P o i n t e r
T o P r o g r a m
M e m o r y
A L U
S h i f t e r
M
U
X
I n t e r n a l
R C O S C
U A R T
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