SH7021 datasheet(361/509 Pages) RENESAS

361 / 509 page

RENESAS 346

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Bit 6 (character length (CHR)): CHR selects seven-bit or eight-bit data in the asynchronous

mode. In the clocked synchronous mode, the data length is always eight bits, regardless of the

CHR setting.

Bit 6: CHR

Description

Eight-bit data (initial value)

Seven-bit data. When seven-bit data is selected, the MSB (bit 7) of the

transmit data register is not transmitted.

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Bit 5 (parity enable (PE)): PE selects whether to add a parity bit to transmit data and check the

parity of receive data, in the asynchronous mode. In the clocked synchronous mode, a parity

bit is neither added nor checked, regardless of the PE setting.

Bit 5: PE

Description

Parity bit not added or checked (initial value)

Parity bit added and checked. 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.

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Bit 4 (parity mode (O/

E): O/E 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 check. The O/

E setting is ignored in the

clocked synchronous mode, or in the asynchronous mode when parity addition and check is

disabled.

Bit 4: O/E

Description

Even parity. If even parity is selected, the parity bit added to transmit

data makes an even number of 1s in the transmitted character and

parity bit combined. Receive data must have an even number of 1s in

the received character and parity bit combined (initial value).

Odd parity. If odd parity is selected, the parity bit added to transmit

data makes an odd number of 1s in the transmitted character and

parity bit combined. Receive data must have an odd number of 1s in

the received character and parity bit combined.

SH7021 Datasheet(PDF) 361 Page - Renesas Technology Corp