Z84C90 ZILOG [Zilog, Inc.], Z84C90 Datasheet - Page 7

• Manufacturer Part Number: Z84C90
• Description: KIO Serial/Parallel Counter Timer
• Manufacturer: ZILOG [Zilog, Inc.]

PS011802-0902
CLKOUT
RESET
XTAL
XTAL
D
A
IORQ
Figure 1. KIO Block Diagram
OSC
0
0
CLK
INT
-D
IE1
IE0
-A
CS
RD
MI
1
0
7
3
Oscillator
Interrupt
Interface
Control
Control
Bus
and
MUX
PIA/
CTC
SIO
PIO
KIO Serial/Parallel Counter Timer
PA
ARDY
ASTB
ZC/TO
CLK/TRG
ZC/TO
CLK/TRG
RXDB
RXCB
TXDB
TXCB
CTSB
DCDB
ZC/TO
CLK/TRG
ZC/TO
CLK/TRG
PB
BRDY
BSTB
PC
RXDA
RXCA
TXDA
TXCA
CTSA
DCDA
0
0
0
-PA
-PB
-PCV
1
3
0
2
7
7
1
3
0
2
Z84C90
2