CONTROL BOARD
TABLE OF CONTENTS
IC Interbnal Block Diagram ............................................. 5-1
Circuit Diagram ................................................................ 5-2
PCB Layout Top & Bottom View ...................................... 5-3
Electrical Parts List .......................................................... 5-4
5-1 5-1
HT16511 INTERNAL BLOCK DIAGRAM
HT48R05A INTERNAL BLOCK DIAGRAM
Voltages:
PA0-PA7
TMR/PC1
WDTS
WDT
PORT C
PC0-PC1
PB0-PB2
PC1
INTC
M
U
X
MP
OSC2
OSC2
RES
VDD
VSS
ACC
Timing
Generator
Program
ROM
Instruction
Registor
Instruction
Decoder
Program
Counter
STACK0
STACK1
INT/PC0
Interrupt
Circuit
DATA
Memory
MUX
ALU
Shifter
Status
TMR
TMRC
M
U
X
Prescaiser
WDT Prescaiser
PCC
PC
PB
PAC
PA
PBC
BZ/BZ
PORT B
PORT A
M
U
X
RC OSC
fsus/4
fsys
DI
DO
CLK
CS
OSC
K0-K3
SW0-SW3
Latch
4-Bit
Serial I/F
Command Decoder
Display RAM
20-Bit x 16 Words
20-Bit
Output Latch
20 12
Segment
OSC
Timing Generator
Key Scan
Key Data RAM
(4 x 12)
5-Bit Latch
16 Bit
Shift Register
Diming Cirduit
Grid
Driver
12
8
8
8
8
8
8
16
Multiplexed
Driver
Driver
S1/K1–
S12/K12
S13/G16–
123456 7891011121314151617181920
00003.8 3.8 0 3.8 3.7 0 0 0 0 0
PIN NO
Voltage 19.7 -22.2 -22.0 -11.2 -19.9 -17.8
PIN NO 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
Voltage -21.8 -15.6 -13.4 - 20 -13.4 -20 -22.4 -18 -20.3 -13.2 -15.8 -11.4 -4.6 -22.6 -20.4 -20.4 -20.4 -20.4 -20.4 -20.4
PIN NO 41 42 43 44 45 46 47 48 49 50 51 52
Voltage -20.4 -20.4 -20.5 -20.4 4.6 4.6 4.6 4.6 0 4.6 0 0.9
IC251 (HT16511)
PIN NO 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
20
Voltage
5.1 5.1 5.1 0 5.1 0 5.1 0 0 4.9 4.9 5.2 0 0 0 0 0 0
IC252 (HT48R05A)
PIN NO b c e
Voltage 4.4 4.1 4.0
Q201 (2SA812)
PIN NO b c e
Voltage 4.9 0 4.8
Q202 (2SA1623)
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