Philips MX3550D/37S Service Manual page 15

CF745 INTERNAL BLOCK DIAGRAM
9-11
EPROM/ROM 9-11
STACK 1
512 X 12 TO
STACK 2
2048 X 12
PC
12
INSTRUCTION
REGISTER
WDT TIME
9
OUT
12
8
INSTRUCTION
DECODER
DIRECT ADDRESS
DIRECT RAM
ADDRESS
8
STATUS
W
ALU
FROM W
4
"TRIS 5"
TRISA PORTA
RA<3:0>
5-2
T0CKI
OSC1 OSC2 MCLR
CONFIGURATION WORD
PIN
"DISABLE" "OSC
SELECT"
WATCHDOG
2
TIMER "CODE
OSCILLATOR/
PROTECT"
CONTROL
CLKOUT
WDT/TMR0
PRESCALER
6
"OPTION"
OPTION REG.
FROM W
5
5-7
24, 25, 72 or
TMR0 FSR
DATA BUS
8
FROM W
FROM W
8
4
8
"TRIS 6" "TRIS 7"
TRISB PORTB
TRISC
4
8
RB<7:0>
PT6311 INTERNAL BLOCK DIAGRAM
D
IN
Serial
D
OUT
TIMING &
Data
CLK
interface
STB
V
DD
"SLEEP"
R
OSC
OSC
GENERAL
PURPOSE
SW 1
REGISTER
Genaral
FILE
SW 2
Input
(SRAM)
SW 3 Register
73 Bytes
SW 4
8
LED 1
LED 2
LED
LED 3
Driver
8
LED 4
8
LED 5
PORTC
8
RC<7:0>
(28-Pin
Devices Only)
5-2
Control
Genaral Segment
Input
Driver/
Register
Grid
Driver/
Timming
Generator
Key Scan
Output
Key Matrix
Memory
Grid
Driver
Dimming
Circuit
K1 K2 K3 K4 VDD GND VEE
SG1/KS1
SG2/KS2
SG3/KS3
SG4/KS4
SG5/KS5
SG6/KS6
SG7/KS7
SG8/KS8
SG9/KS9
SG10/KS10
SG11/KS11
SG12/KS12
SG13/GR16
SG14/GR15
SG15/GR14
SG16/GR13
SG17/GR12
SG18/GR11
SG19/GR10
SG20/GR9
GR1
GR2
GR3
GR4
GR5
GR6
GR7
GR8