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Download III - Renesas Electronics
Transcript
CHAPTER 8 APPLICATIONS OF SERIAL INTERFACE (3) SPD chart T2_6252 IF: SCK0 = LOW THEN Sets busy status Sets BUSYFG ELSE STABIT Issues start bit Transmits slave address WHILE: waits for end of transfer (CSIIF0 = 0) IF: ACK signal not detected THEN Sets error status ELSE Sets ERRFG IF: transmit mode THEN Transmits word address of µ PD6252 WHILE: waits for end of transfer IF: ACK signal not detected THEN Sets error status ELSE Sets ERRFG IF: changes to read mode THEN WHILE: SCK0 = HIGH Outputs high level in order of data and clock Changes slave address to read mode GOTO STABIT ELSE Transmits data WHILE: waits for end of transfer IF: ACK signal not detected THEN Sets error status ELSE Sets ERRFG Receives data WHILE: waits for end of transfer Stores receive data to memory Outputs low level in order of clock and data Issues stop bit 255
