SH7021 datasheet(362/509 Pages) RENESAS

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Bit 3 (stop bit length (STOP)): STOP selects one or two bits as the stop bit length in the

asynchronous mode. This setting is used only in the asynchronous mode. It is ignored in the

clocked synchronous mode because no stop bits are added.

In receiving, only the first stop bit is checked, regardless of the STOP bit setting. If the second

stop bit is 1, it is treated as a stop bit. If the second stop bit is 0, it is treated as the start bit of

the next incoming character.

Bit 3: STOP

Description

One stop bit. In transmitting, a single bit of 1 is added at the end of

each transmitted character (initial value).

Two stop bits. In transmitting, two bits of 1 are added at the end of

each transmitted character.

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Bit 2 (multiprocessor mode (MP)): MP selects multiprocessor format. When multiprocessor

format is selected, settings of the parity enable (PE) and parity mode (O/

E) bits are ignored.

The MP bit setting is used only in the asynchronous mode; it is ignored in the clocked

synchronous mode. For the multiprocessor communication function, see section 13.3.3,

Multiprocessor Communication.

Bit 2: MP

Description

Multiprocessor function disabled (initial value)

Multiprocessor format selected

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Bits 1 and 0 (clock select 1 and 0 (CKS1 and CKS0)): CKS1 and CKS0 select the internal

clock source of the on-chip baud rate generator. Four clock sources are available:

φ, φ/4, φ/16,

and

φ/64. For further information on the clock source, bit rate register settings, and baud rate,

see section 13.2.8, Bit Rate Register.

Bit 1: CKS1

Bit 0: CKS0

Description

System clock (

φ) (initial value)

φ/4

φ/16

φ/64

SH7021 Datasheet(PDF) 362 Page - Renesas Technology Corp