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CHAPTER 15 SERIAL INTERFACE CHANNEL 0 (
µ
PD78014 Subseries)
263
CHAPTER 15
SERIAL INTERFACE CHANNEL 0
(
µ
PD78014 Subseries)
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).
Table 15-1. Differences between Channels 0 and 1
Operation mode
Used pin
Features
Usage
3-wire serial I/O
SCK0, SO0, SI0
• Input and output lines are independent and they can
Serial interface as is the
transfer/receive at the same time, so the data transfer
case with the 75X/XL,
processing time is fast.
78K and 17K Series.
• NEC single-chip microcontrollers provide as before.
SBI mode
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
2-wire serial I/O
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.
Serial Transfer Mode
Channel 0
Channel 1
3-wire serial I/O
Clock selection
f
X
/2
2 Note
, f
X
/2
3
, f
X
/2
4
, f
X
/2
5
, f
X
/2
6
, f
X
/2
7
, f
X
/2
8
, f
X
/2
9
, external clock, TO2 output
Transfer method
MSB/LSB switchable as the start bit
MSB/LSB switchable as the start bit
Automatic transmit/receive function
Transfer end flag
Serial interface channel 0 transfer end
Serial interface channel 1 transfer end
interrupt request flag (CSIIF0)
interrupt request flag (CSIIF1 and TRF)
SBI (serial bus interface)
Use possible
None
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.
Table 15-2. Difference of Serial Interface Channel 0 Modes
Содержание 78014Y Series
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