H838532H datasheet(311/508 Pages) RENESAS

311 / 508 page

Section 10 Serial Communication Interface

Rev. 1.00 May 30, 2008 Page 291 of 484

REJ09B0436-0100

10.2.5

Serial Mode Register (SMR)

Bit

Initial value

Read/Write

COM

R/W

CHR

R/W

STOP

R/W

CKS0

R/W

CKS1

R/W

SMR is an 8-bit register used to set the serial data transfer format and to select the clock source for

the baud rate generator.

SMR can be read or written by the CPU at any time.

SMR is initialized to H'00 upon reset, and in standby, module standby, or watch mode.

Bit 7: Communication mode (COM)

Bit 7 selects whether SCI3 operates in asynchronous mode or synchronous mode.

Bit 7

COM

Description

Asynchronous mode

(initial value)

Synchronous mode

Bit 6: Character length (CHR)

Bit 6 selects either 7 or 8 bits as the data length to be used in asynchronous mode. In synchronous

mode the data length is always 8 bits, irrespective of the bit 6 setting.

Bit 6

CHR

Description

8-bit data/5-bit data*

(initial value)

7-bit data*

1/5-bit data*2

Notes: 1. When 7-bit data is selected, the MSB (bit 7) of TDR is not transmitted.

2. When 5-bit data is selected, set both PE and MP to 1. The three most significant bits

(bits 7, 6, and 5) of TDR are not transmitted.

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