4-Bit Microcontroller - Holtek Semiconductor Inc
Description
HTG12B0 4-Bit Microcontroller
Features
· · · · · · · · ·
Operating voltage: 2.
4V~3.
6V Eight input lines Eight input/output lines Five working registers 4K ´ 8 ´ 4 program ROM 128 ´ 4 ´ 8 (4096) bits data memory RAM Sound effect circuit 40 segment ´ 16 common, 1/4 bias LCD driver LCD output is fixed at 4.
4V
· · · · · · ·
RC oscillator & 32768Hz crystal oscillator 8-bit timer with internal or external clock source Internal timer overflow Up to 4ms instruction cycle with 1MHz system clock One level subroutine nesting Halt feature reduces power consumption 8-bit table read instruction
General Description
The HTG12B0 is a processor from HOLTEK¢s 4-bit stand-alone single chip microcontroller specially designed for LCD display and time piece product applications.
It is ideally suited for multiple LCD for time piece low power applications among which are calculators, scales, calendar and hand held LCD products.
1
September 8, 1999
HTG12B0
Block Diagram
S ta c k
T im e r A L U P A
T M C L K
X IN X O U T O S C I O S C O R E S T E S T 1 T E S T 2 T 1 D T 5 1 2 V D D V S S In s tr u c tio n D e c o d e r R O M B R A M B L C D C C o n tro l & T im in g C ir c u it
P r o g r a m C o u n te r
P A 0 P A 1 P A 2 P A 3 P B 0 P B 1 P B 2 P B 3
A C C P B
R O M R 0 R 1 R 2 R 3 R 4 P S P S 0 P S 1 P S 2 P S 3 P M 0 P M 1 P M 2 P M 3
P M
T e m p o ra ry D a ta R A M D is p la y D a ta R A M S o u n d E ffe c t B Z B Z V L C V L C V L C V L C 2 3 4 1
V O U V O U V O U V O U
T 1 T 2 T 3 T 4 L C D D r iv e r
Note: ACC: Accumulator R0~R4: Working registers ROMB: ROM bank switch RAMB: RAM bank switch LCDC: LCD control register PA, PB: I/O ports PS, PM: Input ports
2 September 8, 1999
S E G 0
S E G 1
S E G 3 8
S E G 3 9
C O M 0
C O M 1
C O M 2
C O M 3
C O M 1 5
HTG12B0
Pad Assignment
S E G 1 0 S E G 1 1 S E G 1 2 S E G 1 3 S E G 1 4 S E G 1 5 S E G 1 6 S E G 1 7 S E G 1 8 T E S T 1
9 2
T E S T 2
S E G 0
S E G 1
S E G 2
S E G 3
S E G 4
S E G 5
S E G 6
S E G...
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