Sharp UP-600 Service Manual page 44

10. WAIT CONTROL
The weight control function built in the MPCA9 is used to provide an
interface with low-speed devices.
1) BLOCK DIAGRAM
The block diagram of the wait control function is shown.
/AS
WAIT
D
enable
For
/Q
RASP-
/RESET
In the figure, the decoder, wait enabling register, AND-OR sections
are the same as those in the MPCA6 or 7, but other components are
newly incorporated in the MPCA5.
EXWAITZ and WAITZ are external weight signals which are to be
ORed inside the MPCA9 and output to the WAITZ. The EXWAITZ is a
general-purpose wait request terminal, and WAITZ is the wait request
signal from the VGA controller.
11. CKDC9
The UP-600 uses one CKDC9 for the CKDC PWB and one CKDC9
for the for POLE display (option) to carry out the following control
operations.
CKDC PWB:
•
Clock (second data readable)
•
Buzzer
•
System reset
•
Key/Clerk switch
Display PWB:
•
Customer display tube
•
Pole display (UP-P16DP)
φ
CLK
START
/RESET for 1,2,3WAIT
WAIT
D
enable
Selector
For
/Q
MISC
/RESET
WAIT
Count
For
RASP
Terminal autoweight signal
/EXWAIT
/VWAIT
/LCDWAIT
WAIT RESET Counter
WAIT D
enable
Selector
For
/Q
VRAM
•
VGA
/RESET
I/O
for
WAIT
1WAIT
Count
For
MISC
/WAITZ
1) INTERFACE
The CKDC9 is connected through the MPCA8.
MPCA8
H8/510
HTS2
SCK2
STH2
INT4
HTS
TXD2(P87) TXDI
HTS1
SCK
SCK1
SCK2(P83) SCKI
STH STH1
RXD2(P84) RXDI
INT1
IRQ0 IRQ0
RESET
RES
STOP
FTI2
(P57)
RESET
D
Selector
/Q
/RESET
WAIT
WAIT
Count
Count
For
For
RASPN
RASPN
UP-P16DP
VFD
VFDC
CKDC9
HTS
SCK
STH
reset from MAIN
RESET
SHEN
HTS
SCK
Key
STH
CKDC9
KRQ
SHEN
RESET SW
SRES
Buzzer
STOP