HD6433636SW datasheet(241/418 Pages) RENESAS

241 / 418 page

227

Bit 6—Character Length (CHR): Bit 6 selects either 7 bits or 8 bits as the data length in

asynchronous mode. In synchronous mode the data length is always 8 bits regardless of the setting

here.

Bit 6: CHR

Description

8-bit data

(initial value)

7-bit data*

Note: * When 7-bit data is selected as the character length in asynchronous mode, the MSB (bit 7)

in the transmit data register is not transmitted.

Bit 5—Parity Enable (PE): In asynchronous mode, bit 5 selects whether or not a parity bit is to

be added to transmitted data and checked in received data. In synchronous mode there is no adding

or checking of parity regardless of the setting here.

Bit 5: PE

Description

Parity bit adding and checking disabled

(initial value)

Parity bit adding and checking enabled*

Note: * When PE is set to 1, then either odd or even parity is added to transmit data, depending on

the setting of the parity mode bit (PM). When data is received, it is checked for odd or even

parity as designated in bit PM.

Bit 4—Parity Mode (PM): In asynchronous mode, bit 4 selects whether odd or even parity is to

be added to transmitted data and checked in received data. The setting here is valid only if parity

adding/checking is enabled in bit PE. In synchronous mode, or if parity adding/checking is

disabled in asynchronous mode, bit PM is ignored.

Bit 4: PM

Description

Even parity*

(initial value)

Odd parity*

Notes: 1. When even parity is designated, a parity bit is added to the transmitted data so that the

sum of 1s in the resulting data is an even number. When data is received, the sum of 1s

in the data plus parity bit is checked to see if the result is an even number.

2. When odd parity is designated, a parity bit is added to the transmitted data so that the

sum of 1s in the resulting data is an odd number. When data is received, the sum of 1s

in the data plus parity bit is checked to see if the result is an odd number.

HD6433636SW Folha de dados(PDF) 241 Page - Renesas Technology Corp