NEC PD78P214 Manuale Utente
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CHAPTER 10 CLOCK SYNCHRONOUS SERIAL INTERFACE
10.1 FUNCTION
The clock synchronous serial interface of the
µPD78214 is configured as shown in Fig. 10-1. The clock synchronous
serial interface supports the following two operation modes:
(1) Three-wire serial I/O mode (MSB first)
Three lines, serial clock (SCK) and serial bus lines (SO, SI), are used to transfer 8-bit data. This mode is suitable
for connecting a display controller or peripheral I/O device having a conventional clock synchronous serial
interface.
for connecting a display controller or peripheral I/O device having a conventional clock synchronous serial
interface.
(2) Serial bus interface (SBI) mode (MSB first)
In this mode, the device can communicate with two or more devices via two lines, the serial clock (SCK) and
serial data bus line (SB0).
serial data bus line (SB0).
This mode conforms to the NEC serial bus format.
In SBI mode, an address for selecting a target device for serial communication, a command specifying the
operation of the target device, and actual data can be output on the serial data bus. This mode eliminates the
need for a handshaking line, which would otherwise be required to connect two or more devices through a
conventional clock synchronous serial interface. The input/output ports can thus used efficiently.
operation of the target device, and actual data can be output on the serial data bus. This mode eliminates the
need for a handshaking line, which would otherwise be required to connect two or more devices through a
conventional clock synchronous serial interface. The input/output ports can thus used efficiently.
10.2 CONFIGURATION
This section describes the configuration of the clock synchronous serial interface.