R01AN1504EJ0100 Datasheet, PDF(19/50 Page) Renesas Technology Corp – Using the DTC to Perform Continuous Clock

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R01AN1504EJ0100 Datasheet, PDF (19/50 Pages) Renesas Technology Corp – Using the DTC to Perform Continuous Clock

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RL78/G14

4.8.6 CSI00 Initialization

Figure 4.10 shows the CSI00 initialization.

Using the DTC to Perform Continuous Clock

Synchronous Serial Communication

R_CSI00_Create

Stop CSI00 communication operation

Disable the CSI00 interrupt

Set the CSI00 interrupt priority level

Clear the CSI00 error flag

Set the CSI00 operating mode

Set the CSI00 communication format

Set the baud rate

Set the output values of

pins SCK00 and SO00

Enable the CSI00 output

Set the pin used by CSI00

ST0 register

ST00 bit â 1

MK0H register

CSIMK00 bit â 1: Interrupt servicing disabled

IF0H register

CSIIF00 bit â 0: No interrupt request signal is generated

PR10H register

CSIPR100 bit â 1

PR00H register

CSIPR000 bit â 1: Interrupt priority level 3 (low priority)

SIR00 register â 0007H

FECT00 bit = 1: Framing error flag clear

PECT00 bit = 1: Parity error flag clear

OVCT00 bit = 1: Overrun error flag clear

SMR00 register â 0020H

CKS00 bit = 0: Operation clock: CK00 (2 MHz = 32 MHz/24)

CCS00 bit = 0: Operation clock: Divided clock frequency of the operating clock

Bits MD002 and MD001 = 00B: CSI mode

MD000 bit = 0: Interrupt source: transfer end interrupt

SCR00 register â C007H

Bits TXE00 and RXE00 = 11B: Transmission/reception

Bits DAP00 and CKP00 = 00B: Data and clock phase: Type 1

DIR00 bit = 0: MSB first

Bits DLS001 and DLS000 = 11B: 8-bit data length

SDR00 register â CE00H: Transfer clock set by dividing the operating clock: fMCK/208

9615bps = 2 MHz Ã· 208

SO0 register

CKO00 â 1: Serial clock output value: 1

SO00 bit â 0: Serial data output value: 0

SOE0 register

SOE00 bit â 1

PM5 register

PM50 bit â 1: SI00 pin: Input mode

P5 register

P51 â 1: SO00 pin: Output 1

PM5 register

PM51 bit â 0: SO00 pin: Output mode

P3 register

P30 â 1: SCK00 pin: Output 1

PM3 register

PM30 bit â 0: SCK00 pin: Output mode

return

Figure 4.10 CSI00 Initialization

R01AN1504EJ0100 Rev. 1.00

Feb. 14, 2014

Page 19 of 47

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