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Preliminary User’s Manual U13420EJ2V0UM00
CHAPTER 14 SERIAL INTERFACE (SIO1)
14.1 Serial Interface (SIO1) Functions
The serial interface (SIO1) employs the following three modes.
• Operation stop mode
• 3-wire serial I/O mode
• 3-wire serial I/O mode with automatic transmit/receive function
(1) Operation stop mode
This mode is used when serial transfer is not carried out.
(2) 3-wire serial I/O mode (MSB/LSB first switchable)
This mode is used for 8-bit data transfer using three lines, each for serial clock (SCK1), serial output (SO1)
and serial input (SI1).
The 3-wire serial I/O mode enables simultaneous transmission/reception and so decreases the data transfer
processing time.
Since the start bit of the 8-bit data that undergoes serial transfer is switchable between MSB and LSB,
connection is enabled with either start bit device.
The 3-wire serial I/O mode is valid for connection of peripheral I/O units and display controllers which
incorporate a conventional synchronous serial interface.
(3) 3-wire serial I/O mode with automatic transmit/receive function
This mode has an automatic transmit/receive function in addition to the functions in (2) above.
The automatic transmit/receive function is used to transmit/receive data with a maximum of 32 bytes. This
function enables the hardware to transmit/receive data independently of the CPU, to/from the OSD (On Screen
Display) device and a device with a built-in display controller/driver, thus lightning the software load can be
alleviated.
Содержание mPD780065 Series
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