Z80 Datasheet, PDF (229/330 Pages) Zilog, Inc. – Z80 CPU PERIPHERALS

Z80 CPU Peripherals
User Manual
209
• CRC generation and checking
• Separate Modem Control Inputs and Outputs for Both Channels
• CRC-16 or CRC-CCITT Block Check
• Daisy-Chain Priority Interrupt Logic Provides Automatic Interrupt
Vectoring Without External Logic
• Modem Status can be Monitored
+5V GND Φ
International
Control
Logic
Channel A
Read/Write
Registers
Data ⁸
Control ⁶
CPU
Bus I/O
International
Control
Logic
Channel B
Read/Write
Registers
Interrupt
Control
Lines
Figure 100. Z80 SIO Block Diagram
Channel A
Discrete
Control and
Status
(Channel A)
Discrete
Control and
Status
(Channel B)
Channel B
Serial Data
Channel Clocks
SYNC
Wait/Ready
Modem
or other
Controls
Modem
or other
Controls
Serial Data
Channel Clocks
SYNC
Wait/Ready
UM008101-0601
Serial Input/Output