Sharp ER-A440 Service Manual page 13

2) Block diagram
A23~A0
IRLON
ROS1
ROS2
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.
Address decode
External CS
Internal CS
Divider
Print pulse control
RASEL
SSP comparison register
Image
control
CHS
serial select
Print mode PMD
Fig. 2-4
4 – 6
SSPRQ
BAR.
I/R Control
Multiplexer
INTO
control
Printer control port
IRTX
IRRX
RCI
ASKRX
TXDI
SCKI
RXDI
HTS1
SCK1
STH1
HTS2
SCK2
STH2
INT4
INT1
INT2
INT3
EXINT0
EXINT1
EXINT2
EXINT3
IRQ0
TEST
MTD
MTD
RJMTR
Motor
SLMTD
drive
SLMTS
SLMTR
SLMTD