Zilog Z08470 - Manual (Page 229)

Z80 CPU Peripherals
User Manual
UM008101-0601 Serial Input/Output
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
Figure 100. Z80 SIO Block Diagram
CPU
Bus I/O
+5V GND
Φ
Data
Control
International
Control
Logic
Channel A
Read/Write
Registers
Channel B
Read/Write
Registers
International
Control
Logic
8
6
Interrupt
Control
Lines
Channel B
Discrete
Control and
Status
(Channel A)
Channel A
Modem
or other
Serial Data
Channel Clocks
Discrete
Control and
Status
(Channel B)
SYNC
Wait/Ready
Controls
Modem
or other
Controls
Serial Data
Channel Clocks
SYNC
Wait/Ready