Block Diagram - Sharp ER-A770 Manual

10. WAIT control
The weight control function built in the MPCA8 is used to provide an
interface with low-speed devices.

10-1. Block diagram

The block diagram of the wait control function is shown.
/AS
WAIT
enable
For
RASP-
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 MPCA7.
EXWAITZ and WAITZ are external weight signals which are to be
ORed inside the MPCA8 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 ER-A770 on CKDC9 for the CKDC PWB and one CKDC9 for
POLE display (option) to carry out the following control operations.
CKDC PWB CKDC9:
Clock (second data readable)
Buzzer
System reset
Key/Clerk switch
POLE CKDC9(UP-P16DP or UP-I16DP)
Customer display tube
11-1. Interface
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
φ
/RESET for 1,2,3WAIT
WAIT
D
D
enable
Selector
For
/Q
/Q
MISC
/RESET
/RESET
WAIT
Count
For
RASP
Terminal autoweight signal
/EXWAIT
/VWAIT
UP-P16DP/UP-I16DP
VFD
VFDC
CKDC9
HTS
SCK
STH
RESET reset from MAIN
SHEN
HTS
SCK
Key
STH
CKDC9
KRQ
SHEN
RESET SW
SRES
Buzzer
STOP
CLK WAIT RESET Counter
START
WAIT D
enable
Selector
For
/Q
VRAM
•
VGA
/RESET
I/O
for
WAIT
WAIT
1WAIT
Count
Count
For
MISC
RASPN
/WAITZ
/LCDWAIT
Fig. 10
12. Option RAM interface
12-1. Interface
The expanded RAM connector terminals are shown in the table.
The 72 pin S.O. DIMM is used for the connector.
Extension RAM connector terminals
Signal Pin
Name No.
GND 1
GND 2
— 3
— 4
— 5
— 6
— 7
— 8
— 9
— 10
A14 11
A15 12
A16 13
A17 14
A18 15
A19 16
— 17
PCE22_E 18
PCE21_E 19
— 20
PSREF 21
PCE22_O 22
PCE21_O 23
GND 24
D
Selector
/Q
/RESET
WAIT
Count
For
For
RASPN
Signal Pin Signal
Name No. Name
— 25 D9
— 26 D8
— 27 D7
— 28 D6
A13 29 D5
A12 30 D4
A11 31 D3
A10 32 D2
A9 33 D1
A8 34 D0
A7 35 GND
A6 36 NC
A5 37 OWR
A4 38 —
A3 39 —
A2 40 —
A1 41 —
A0 42 —
D15 43 HWR
D14 44 —
D13 45 VMEM
D12 46 VMEM
D11 47 GND
D10 48 GND
Pin
No.
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72