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CHAPTER 14 SERIAL INTERFACE (SIO1)
Preliminary User’s Manual U13420EJ2V0UM00
14.4.3 3-wire serial I/O mode with automatic transmit/receive function
This 3-wire serial I/O mode is used for transmission/reception of a maximum 32-byte data without the use of
software. Once transfer is started, the data prestored in the RAM can be transmitted by the set number of bytes,
and data can be received and stored in the RAM by the set number of bytes.
Handshake signals (STB and BUSY) are supported by hardware to transmit/receive data continuously. OSD (On
Screen Display) LSI and peripheral LSIs including an LCD controller/driver can be connected without difficulty.
(1) Register setting
The 3-wire serial I/O mode with automatic transmit/receive function is set with the serial operation mode
register 1 (CSIM1), the automatic data transmit/receive control register (ADTC0) and the automatic data
transmit/receive interval specification register (ADTI0).
(a) Serial operation mode register 1 (CSIM1)
CSIM1 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets CSIM1 to 00H.
Caution
In serial I/O mode, set the port mode register (PMXX) as follows. In each case, set the
output latch to 0.
• During serial clock output (master transmission or master reception)
Set P82 (SCK1) to output mode (PM82 = 0).
• During serial clock input (slave transmission or slave reception)
Set P82 to input mode (PM82 = 1).
• During transmission/transmission and reception mode
Set P83 (SO01) to output mode (PM83 = 0).
• During reception mode
Set P84 (SI1) to input mode (PM84 = 1).
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