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The µ PD78014 Subseries incorporates two channels of clock synchronous serial interfaces.
Differences between channels 0 and 1 are as follows (Refer to CHAPTER 17 SERIAL INTERFACE CHANNEL
1 for details of the serial interface channel 1).
Serial Transfer Mode
3-wire serial I/O
SBI (serial bus interface)
2-wire serial I/O
Note
Can be set only when the main system clock oscillates at 4.19 MHz or less.
Differences of Serial interface channel 0 modes are shown in Table 15-2.
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Operation mode
3-wire serial I/O
SBI mode
2-wire serial I/O
CHAPTER 15 SERIAL INTERFACE CHANNEL 0 ( µ PD78014 Subseries)
CHAPTER 15 SERIAL INTERFACE CHANNEL 0
( µ PD78014 Subseries)
Table 15-1. Differences between Channels 0 and 1
2 Note
Clock selection
f
/2
, f
/2
X
X
Transfer method
MSB/LSB switchable as the start bit
Transfer end flag
Serial interface channel 0 transfer end
interrupt request flag (CSIIF0)
Use possible
Table 15-2. Difference of Serial Interface Channel 0 Modes
Used pin
SCK0, SO0, SI0
• Input and output lines are independent and they can
transfer/receive at the same time, so the data transfer
processing time is fast.
• NEC single-chip microcontrollers provide as before.
SCK0, SB0 or
• Enables to configure serial bus with two signal lines,
SB1
thus, even when connect to some microcontrollers,
the number of ports can be cut and reduced the wiring
and drawing around on a board.
• High-speed serial interface to be complianced with the
NEC standard bus format.
• Address and command information onto the serial bus
SCK0, SB0 or
• Enables to configure serial bus with two signal lines,
SB1
thus, even when connect to some microcontrollers,
the number of ports can be cut and reduced the wiring
and drawing around on a board.
• Enables to cope with any data transfer format by
program.
Channel 0
3
4
5
6
7
8
, f
/2
, f
/2
, f
/2
, f
/2
, f
/2
, f
X
X
X
X
X
X
Features
Channel 1
9
/2
, external clock, TO2 output
MSB/LSB switchable as the start bit
Automatic transmit/receive function
Serial interface channel 1 transfer end
interrupt request flag (CSIIF1 and TRF)
None
Usage
Serial interface as is the
case with the 75X/XL,
78K and 17K Series.
263
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