www.DataSheet4U.com
CHAPTER 15 SERIAL INTERFACE CHANNEL 0 (
µ
PD78014 Subseries)
264
15.1 Serial Interface Channel 0 Functions
Serial interface channel 0 employs the following four modes.
• Operation stop mode
• 3-wire serial I/O mode
• SBI (serial bus interface) mode
• 2-wire serial I/O mode
Caution
Do not switch the operation mode (3-wire serial I/O/2-wire serial I/O/SBI) during the serial interface
channel 0 operation enable. The operation mode should be switched after stopping the serial
operation.
(1) Operation stop mode
This mode is used when serial transfer is not carried out. Power dissipation can be reduced.
(2) 3-wire serial I/O mode (MSB-/LSB-first selectable)
This mode is used to 8-bit data transfer using three lines, one each for serial clock (SCK0), serial output (SO0)
and serial input (SI0).
This mode enables simultaneous transmission/reception and therefore reduces the data transfer processing time.
The start bit of transferred 8-bit data is switchable between MSB and LSB, so that devices can be connected
regardless of their start bit recognition.
This mode should be used when connecting with peripheral I/O devices or display controllers which incorporate
a conventional synchronous clocked serial interface as is the case with the 75X/XL, 78K, and 17K series.
(3) SBI (serial bus interface) mode (MSB-first)
This mode is used for 8-bit data transfer with two or more devices using two lines of serial clock (SCK0) and serial
data bus (SB0 or SB1) (See Figure 15-1).
The SBI mode complies with the NEC serial bus format and distinguishes the transfer data into “address”,
“command”, and “data” to transmit or receive the data.
•
Address
: Data to select objective devices in serial communication
•
Command : Data to instruct objective devices
•
Data
: Data to be actually transferred
In the actual transfer, the master device first outputs the “address” to the serial bus, and selects the slave device
as communication target from among two or more devices. The serial transfer is then performed by transmitting
and receiving “command” and “data” between the master and slave devices. The receiver automatically
distinguishes the received data into “address”, “command”, or “data”, by hardware.
This function enable to use input/output ports effectively and to simplify a serial interface controller of application
programs.
In addition, wake-up function for handshake, acknowledge signal, and busy signal output function can be used.
Содержание 78014Y Series
Страница 2: ...www DataSheet4U com 2 MEMO...
Страница 8: ...www DataSheet4U com 8 MEMO...
Страница 22: ...www DataSheet4U com 22 MEMO...
Страница 30: ...www DataSheet4U com 30 MEMO...
Страница 34: ...www DataSheet4U com 34 MEMO...
Страница 62: ...www DataSheet4U com CHAPTER 2 OUTLINE PD78014Y Subseries 62 MEMO...
Страница 78: ...www DataSheet4U com CHAPTER 3 PIN FUNCTION PD78014 Subseries 78 MEMO...
Страница 94: ...www DataSheet4U com CHAPTER 4 PIN FUNCTION PD78014Y Subseries 94 MEMO...
Страница 170: ...www DataSheet4U com CHAPTER 7 CLOCK GENERATOR 170 MEMO...
Страница 222: ...www DataSheet4U com CHAPTER 9 8 BIT TIMER EVENT COUNTER 222 MEMO...
Страница 230: ...www DataSheet4U com CHAPTER 10 WATCH TIMER 230 MEMO...
Страница 262: ...www DataSheet4U com CHAPTER 14 A D CONVERTER 262 MEMO...
Страница 318: ...www DataSheet4U com CHAPTER 15 SERIAL INTERFACE CHANNEL 0 PD78014 Subseries 318 MEMO...
Страница 408: ...www DataSheet4U com CHAPTER 16 SERIAL INTERFACE CHANNEL 0 PD78014Y Subseries 408 MEMO...
Страница 446: ...www DataSheet4U com CHAPTER 17 SERIAL INTERFACE CHANNEL 1 446 MEMO...
Страница 472: ...www DataSheet4U com CHAPTER 18 INTERRUPT FUNCTIONS AND TEST FUNCTION 472 MEMO...
Страница 502: ...www DataSheet4U com CHAPTER 22 PD78P014 78P014Y 502 MEMO...
Страница 520: ...www DataSheet4U com CHAPTER 23 INSTRUCTION SET 520 MEMO...