362
6.9
Serial Communication Interface
6.9.1
Features
•
Three independent on-chip channels in the H8S/2678 Series
•
Selection of synchronous or asynchronous serial communication mode
•
Full-duplex communication capability
•
Selection of LSB-first or MSB-first transfer
•
Built-in baud rate generator allows any bit rate to be selected
•
Selection of transmit/receive clock source
•
DTC and DMAC can be activated by four interrupts (ERI, RXI, TXI, and TEI)
•
Module stop mode can be set
6.9.2
Block Diagram
RxD
TxD
SCK
Clock
ø
ø/4
ø/16
ø/64
TEI
TXI
RXI
ERI
SCMR
SSR
SCR
SMR
Transmission/
reception control
Baud rate
generator
BRR
Module data bus
Bus interface
Internal
data bus
RDR
TSR
RSR
Parity generation
TDR
Legend
SCMR: Smart card mode register
RSR:
Receive shift register
RDR:
Receive data register
TSR:
Transmit shift register
TDR:
Transmit data register
SMR:
Serial mode register
SCR:
Serial control register
SSR:
Serial status register
BRR:
Bit rate register
External clock
Parity check
Figure 6.9 Block Diagram of SCI
Содержание H8S/2670
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