Renesas Asynchronous SH7145F Bedienungsanleitung PDF herunterladen (Seite 10)

SH7145F

Asynchronous Serial Data Transmission

REJ06B0355-0100O/Rev.1.00 March 2004 Page 8 of 16

Table 6: On-Chip Register Descriptions

Bit

Set Value Function

MSTCR1 MSTP17 0 Module standby control register 1

SCI1 standby control bit

Standby cancelled when MSTP17 = 0

SCR_1 H'20 Serial control register 1 (SCI_1)

Transmit and receive control, interrupt control, transmit and receive

clock source control

TIE 0 Transmit interrupt enable

TXI interrupt requests enabled when set to 1

RIE 0 Receive interrupt enable

RXI and ERI interrupt requests enabled when set to 1

TE 1 Transmit enable

Transmit operations enabled when set to 1

RE 0 Receive enable

Receive operations enabled when set to 1

MPIE 0 Multiprocessor interrupt enable

(In asynchronous mode, enabled when MP = 1 in SMR)

In the task example, disabled because MP = 0

TEIE 0 Transmit end interrupt enable

TEI interrupt requests enabled when set to 1

CKE1

CKE2

Clock enable 1, 0

Selects clock source and SCK pin function

In the task example, clock source is on-chip clock and SCK pin is not

used

SMR_1 H'00 Serial mode register 1

Selects communication format and the clock source for on-chip baud

rate generator

C/A 0 Communication mode

Asynchronous mode when cleared to 0

CHR 0 Character length (enabled in asynchronous mode only)

8-bit transmission and reception when 0

PE 0 Parity enable (enabled in asynchronous mode only)

No-parity transmission and reception when 0

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

(In this example PE = 0 and this bit is disabled)

STOP 0 Stop bit length (enabled in asynchronous mode only)

1-stop-bit transmission and reception when 0

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16 17 18

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