Sharp ER-A750 Service Manual page 36

2) Block diagram
A23~A0
IRLON
ROS1
ROS2
Address decode
RAS1
RAS2
RAS3
OPTCS
D0~D7
Buffer
AS
RD
WR
RDO
WRO
Read/write
control
RESET
RES
VRESC
POFF
MD0
MD1
WAIT
WAIT
control
EXWAIT
CAPS
select
RJRST
SLRST
*PRST
Print gate
RJTMG
SLTMG
PTMG
* Output selection with CAPS.
PRST/PTMG.
RASEL
Image
External CS
control
Internal CS
Divider
Print pulse control
SSP comparison register
BAR.
CHS
serial select
INTO
control
Print mode PMD
Printer control port
Fig. 2-4
7 – 6
SSPRQ
IRTX
IRRX
I/R Control
RCI
ASKRX
TXDI
SCKI
RXDI
HTS1
Multiplexer SCK1
STH1
HTS2
SCK2
STH2
INT4
INT1
INT2
INT3
EXINT0
EXINT1
EXINT2
EXINT3
IRQ0
TEST
MTD
MTD
RJMTR
Motor
SLMTD
drive
SLMTS
SLMTR
SLMTD