Section 12 Serial Communication Interface (SCI)
Rev. 3.00 Sep. 27, 2007 Page 417 of 758
REJ09B0243-0300
Bit Bit
Name
Initial
value
R/W Description
6 CHR 0 R/W
Character
Length
Selects 7-bit or 8-bit data in asynchronous mode. In the
clock synchronous mode, the data length is always
eight bits, regardless of the CHR setting. When 7-bit
data is selected, the MSB (bit 7) of the transmit data
register is not transmitted.
0: 8-bit data
1: 7-bit data
5 PE 0 R/W
Parity
Enable
Selects whether to add a parity bit to transmit data and
to check the parity of receive data, in asynchronous
mode. In clock synchronous mode, a parity bit is neither
added nor checked, regardless of the PE setting.
0: Parity bit not added or checked
1: Parity bit added and checked
*
Note:
*
When PE is set to 1, an even or odd parity bit
is added to transmit data, depending on the
parity mode (O/
E
) setting. Receive data parity
is checked according to the even/odd (O/
E
)
mode setting.
4 O/
E
0 R/W
Parity
mode
Selects even or odd parity when parity bits are added
and checked. The O/
E
setting is used only in
asynchronous mode and only when the parity enable bit
(PE) is set to 1 to enable parity addition and checking.
The O/
E
setting is ignored in clock synchronous mode,
or in asynchronous mode when parity addition and
checking is disabled.
0: Even parity
1: Odd parity
If even parity is selected, the parity bit is added to
transmit data to make an even number of 1s in the
transmitted character and parity bit combined. Receive
data is checked to see if it has an even number of 1s in
the received character and parity bit combined.
If odd parity is selected, the parity bit is added to
transmit data to make an odd number of 1s in the
transmitted character and parity bit combined. Receive
data is checked to see if it has an odd number of 1s in
the received character and parity bit combined.
Содержание SH7124 R5F7124
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