Z84C90 Datasheet, PDF (14/31 Pages) Zilog, Inc. – KIO Serial/Parallel Counter Timer

Z84C90
KIO Serial/Parallel Counter Timer
9
Table 2. KIO Registers
Address
A3 A2 A1 A0
Register 0: PIO Port A Data
0000
Register 1: PIO Port A Command
0001
Register 2: PIO Port B Data
0010
Register 3: PIO Port B Command
0011
Register 4: CTC Channel 0
0100
Register 5: CTC Channel 1
0101
Register 6:
0110
Register 7:
0111
Register 8: SIO Port A Data
1000
Register 9: SIO Port A Command/Status
1001
Register 10: SIO Channel B Data
1010
Register 11: SIO Channel B Command/Status
1011
Register 12: PIA Port C Data
1100
Register 13: PIA Port C Command
1101
Register 14: KIO Command
1110
Register 15: Reserved
1111
Note: Additionally, IORQ and CS must be Low. Registers are written to or read from by the CPU,
applying a 1 or a 0 respectively on the RD pin.
Standard Test Conditions
The DC Characteristics and Capacitance sections below apply to the following standard
test conditions, unless otherwise noted. All voltages are referenced to GND (0V). Posi-
tive current flows into the referenced pin.
Available operating temperature ranges are:
• S = 0° C to +70° C
• E = –40° C to +100° C
Voltage Supply Range: +5.0V ± 10%
All AC parameters assume a load capacitance of 100 pF. Add 10 ns delay for each 50 pF
increase in load up to a maximum of 200 pF for the data bus and 100 pF for the address
and control lines. AC timing measurements are referenced to 1.5 volts (except for
CLOCK, which is referenced to the 10% and 90% points.
PS011802-0902