Section 14 Serial Communication Interface with FIFO (SCIF)
Rev. 2.00 Mar 09, 2006 page 593 of 906
REJ09B0292-0200
Table 14.9 SCSMR and SCSCR Settings for SCIF Clock Source Selection
SCSMR
SCSCR Setting
SCIF Transmit/Receive Clock
Bit 7:
C/
A
A
A
A
Bit 1:
CKE1
Bit 0:
CKE0
Mode
Clock
Source
SCK Pin Function
0
0
0
Asynchronous
mode
Internal
SCIF does not use SCK pin
1
Outputs clock with frequency of
16/8/4 times bit rate
1
0
External
Inputs clock with frequency of 16/8/4
1
times bit rate
1
0
0
Synchronous
Internal
Outputs serial clock
1
mode
1
0
External
Inputs serial clock
1
14.3.2
Operation in Asynchronous Mode
In asynchronous mode, characters are sent or received, each preceded by a start bit indicating the
start of communication and followed by one or two stop bits indicating the end of communication.
Serial communication is thus carried out with synchronization established on a character-by-
character basis.
Inside the SCIF, the transmitter and receiver are independent units, enabling full-duplex
communication. Both the transmitter and the receiver also have a 16-stage FIFO buffer structure,
so that data can be read or written during transmission or reception, enabling continuous data
transfer.
Figure 14.3 shows the general format for asynchronous serial communication.
In asynchronous serial communication, the communication line is usually held in the mark state
(high level). The SCIF monitors the line, and when it goes to the space state (low level),
recognizes a start bit and starts serial communication.
One serial communication character consists of a start bit (low level), followed by data (LSB-first
or MSB-first order selectable), a parity bit or multiprocessor bit (high or low level), and finally
one or two stop bits (high level).
Summary of Contents for SH7616
Page 10: ...Rev 2 00 Mar 09 2006 page x of xxvi ...
Page 132: ...Section 2 CPU Rev 2 00 Mar 09 2006 page 106 of 906 REJ09B0292 0200 ...
Page 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Page 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Page 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Page 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Page 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Page 935: ...SH7616 Hardware Manual ...