SH7125 Datasheet, PDF (432/782 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer

Section 12 Serial Communication Interface (SCI)
• Four types of interrupts: There are four interrupt sources, transmit-data-empty, transmit end,
receive-data-full, and receive error interrupts, and each interrupt can be requested
independently.
• Module standby mode can be set
Figure 12.1 shows a block diagram of the SCI.
RXD
TXD
SCK
SCRDR
SCRSR
Module data bus
SCTDR
SCSSR
SCSCR
SCBRR
SCTSR
SCSMR
SCSPTR
SCSDCR
Transmission/reception
control
Baud rate
generator
Parity generation
Parity check
Clock
External clock
SCI
[Legend]
SCRSR: Receive shift register
SCRDR:
SCTSR:
SCTDR:
SCSMR:
Receive data register
Transmit shift register
Transmit data register
Serial mode register
SCSCR: Serial control register
SCSSR: Serial status register
SCBRR: Bit rate register
SCSPTR: Serial port register
SCSDCR: Serial direction control register
Figure 12.1 Block Diagram of SCI
Internal
data bus
Pφ
Pφ/4
Pφ/16
Pφ/64
TEI
TXI
RXI
ERI
Rev. 3.00 Sep. 27, 2007 Page 412 of 758
REJ09B0243-0300