User’s Manual U16899EJ2V0UD326CHAPTER 15 SERIAL INTERFACES CSI10 AND CSI11TheμPD78F0132H incorporate serial interface CSI10, and theμPD78F0133H, 78F0134H, 78F0136H, 78F0138H,and 78F0138HD incorporate serial interfaces CSI10 and CSI11.15.1 Functions of Serial Interfaces CSI10 and CSI11Serial interfaces CSI10 and CSI11 have the following two modes.• Operation stop mode• 3-wire serial I/O mode(1) Operation stop modeThis mode is used when serial communication is not performed and can enable a reduction in the powerconsumption.For details, see 15.4.1 Operation stop mode.(2) 3-wire serial I/O mode (MSB/LSB-first selectable)This mode is used to communicate 8-bit data using three lines: a serial clock line (SCK1n) and two serial datalines (SI1n and SO1n).The processing time of data communication can be shortened in the 3-wire serial I/O mode because transmissionand reception can be simultaneously executed.In addition, whether 8-bit data is communicated with the MSB or LSB first can be specified, so this interface canbe connected to any device.The 3-wire serial I/O mode is used for connecting peripheral ICs and display controllers with a clocked serialinterface.For details, see 15.4.2 3-wire serial I/O mode.
