375CHAPTER 18 SERIAL INTERFACE CHANNEL 0 (μPD78078Y Subseries)Figure 18-4. Serial Operating Mode Register 0 FormatNotes 1. Bit 6 (COI) is a read-only bit.2. I 2 C bus mode, the clock frequency becomes 1/16 of that output from TO2.3. Can be used as P25 (CMOS input/output) when used only for transmission.4. Can be used freely as port function.5. Set bit 5 (SIC) of the interrupt timing specify register (SINT) to 1 when using the wake-upfunction (WUP = 1). Do not execute a write instruction to the serial I/O shift register 0 (SIO0)while WUP = 1.6. When CSIE0 = 0, COI becomes 0.Remark x : Don’t carePMxx : Port mode registerPxx : Port output latch<6> <5> 4 3 2 1 0<7>SymbolCSIM0 CSIE0 COI WUP CSIM04 CSIM03 CSIM02 CSIM01 CSIM00CSIM0101Serial Interface Channel 0 Clock SelectionInput clock to SCK0/SCL pin from off-chip8-bit timer register 2 (TM2) output0R/W1 Clock specified with bits 0 to 3 of timer clock select register 3 (TCL3)CSIM040CSIM00x01FF60H 00H R/WNote 1Address After Reset R/WR/W CSIM03CSIM02PM25 P25 PM26 P26 PM27 P27 OperationMode Start Bit SI0/SB0/SDA0/P25 Pin FunctionSO0/SB1/SDA1/P26 Pin FunctionSCK0/SCL/P27Pin Functionx 1MSBLSB1 x 0 0 0 1Note 3 3-wire seriall/O modeSI0(Input)SO0(CMOS output)SCK0 (CMOSinput/output)Note 32-wire seriall/O modeorI 2C bus mode0SCK0/SCL(N-ch open-draininput/output)11 1x0x00x0x0011Note 4 Note 4Note 4 Note 4MSBP25 (CMOSinput/output)SB0/SDA0(N-ch open-draininput/output)SB1/SDA1(N-ch open-draininput/output)P26 (CMOSinput/output)Note 3WUP01Wake-up Function ControlNote 5Interrupt request signal generation with each serial transfer in any modeInterrupt request signal generation when the address received after detecting start condition(when CMDD = 1) matches the slave address register (SVA) data in I 2C bus modeR/WCOI01Slave Address Comparison Result FlagNote 6Slave address register (SVA) not equal to serial I/O shift register 0 (SIO0) dataSlave address register (SVA) equal to serial I/O shift register 0 (SIO0) dataRCSIE001Serial Interface Channel 0 Operation ControlOperation stoppedOperation enabledR/WNote 2
