Renesas Asynchronous SH7145F Bedienungsanleitung PDF herunterladen (Seite 8)

SH7145 Group

SCI Break Detection

REJ06B0384-0100Z/Rev.1.00 September 2004 Page 8 of 20

Table 6 Description of Internal Registers (2)

Name Bit Bit Name Setting Function

H'00 Serial mode register_0

Selects communication format and clock source for the

internal baud rate generator.

7 C/A 0 Communication mode

When C/A = 0, SCI0 operates in asynchronous mode.

6 CHR 0 Character length (only valid in asynchronous mode)

When CHR = 0, communication data length is 8 bits.

5 PE 0 Parity enable (only valid in asynchronous mode)

When PE= 0, communication is performed with no

parity.

4 O/E 0 Parity mode (valid when PE = 1 in asynchronous mode)

In this sample task, PE = 0 and so this bit is invalid.

3 STOP 0 Stop bit length (only valid in asynchronous mode)

When STOP = 0, one stop bit is used.

2 MP 0

Multiprocessor mode (only valid in asynchronous mode)

When MP = 0, multiprocessor communication function is

disabled.

SMR_0

CKS1

CKS0

Clock select 1, 0

When CKS1 = CKS0 = 0, the clock source for the

internal baud rate generator is set to Pφ.

BRR_0 H'40 Bit rate register_0

An 8-bit register used to adjust the bit rate.

SDCR_0 H'F2 Serial direction control register_0

The DIR bit (bit 3) is used to select LSB/MSB-first; in this

sample task, set to DIR = 0 (LSB-first).

H'xx Serial status register_0

Consists of SCI0 status flags and communication

multiprocessor bits; only 0 can be written to the status

flags for flag clearing.

7 TDRE * Transmit data register empty (status flag)

6 RDRF * Receive data register full (status flag)

5 ORER * Overrun error (status flag)

4 FER * Framing error (status flag)

3 PER * Parity error (status flag)

2 TEND * Transmit end (status flag)

1 MPB 0 Multiprocessor bit

SSR_0

0 MPBT 0 Multiprocessor bit transfer

Port A control register L2 PACRL2

0 PA0MD 1 PA0 mode bit

Specifies the function of PA0, a multiplexed pin of Port A

(RxD0).

Note: * Only clearing is possible; setting to 1 is done by hardware.

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 19 20

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