NEC PD78214 - Manual (Page 45)

16
µ
PD78214 Sub-Series
1.4 EXAMPLE APPLICATION SYSTEM (PRINTER)
M
P00-P03
M
P04-P07 TO SCK SO T X
D
R
X
D
Ports AV
REF
AV
SS
AN0 AN1 AN2-AN7
Temperature sensor
Motor supply voltage
SW input for each mode
RESET
X1
X2
V
SS
V
DD
A8-A15
ASTB
AD0-AD7
REFRQ
WR RD
A16-A19
PD78214
µ
Decoder
Latch
Data bus Address bus
Gate array I/O expansion Centronics interface, etc.
PROM
PD27C256A
µ
Pseudo SRAM
PD24C1000
µ
Kanji character generator
Print head driver Shift register
RS-232C driver
Stepping motor Carriage motor Paper feed motor