Functions Of Serial Interface Channel 0 - NEC mPD780208 Subseries User Manual

13.1 Functions of Serial Interface Channel 0

Serial interface channel 0 has the following four modes.
Operation Mode Pins Used
Operation stop
mode
3-wire serial I/O SCK0 (serial clock),
mode SO0 (serial output),
SI0 (serial input)
SBI mode SCK0 (serial clock),
SB0 or SB1 (serial
data bus)
2-wire serial I/O SCK0 (serial clock),
mode SB0 or SB1 (serial
data bus)
Caution Do not change the operation mode (3-wire serial I/O, 2-wire serial I/O, or SBI) while the
operation of serial interface channel 0 is enabled. Stop the serial operation before changing
the operation mode.
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CHAPTER 13 SERIAL INTERFACE CHANNEL 0
Table 13-2. Modes of Serial Interface Channel 0
– • Used when serial transfer is not carried out.
• Power consumption can be reduced.
• Input and output lines are independent and
they can transfer/receive at the same time,
so the data transfer processing time is short.
• The start bit of 8-bit data to undergo serial
transfer is switchable between MSB and LSB.
• Enables configuration of serial bus with two
signal lines, thus, even when connected to
some microcontrollers, the number of ports
can be cut and the wiring on the board
reduced.
• High-speed serial interface complying with
the NEC Electronics standard bus format.
• Address, command, and data information
sent on the serial bus
• The wakeup function for handshake and
acknowledge and busy signal output function
can also be used.
• Can cope with any data transfer format by
program. Thus, the handshake lines
previously necessary for connection of two or
more devices can be removed.
User's Manual U11302EJ4V0UM
Features Usage
–
These modes are used
for connection of
peripheral ICs and
display controllers that
incorporate a clocked
serial interface.