Panasonic F77G, MN101C77C user manual Msb

Chapter 11 Serial Interface 0, 1

11-3-4 Setup Example

„Transmission / Reception Setup Example

The setup example for clock synchronous serial communication with serial 0 is shown. Table 11-3-16 shows the conditions at transmission / reception.

Table 11-3-16 Setup Examples for Synchronous Serial Interface Transmission / Reception

Setup item	set to	Setup item	set to
SBI / SBO pin	Independent	Clock source	fs/2
	(with 3 channels)
Transfer bit count	8 bits	Used pin	A (port 0)
Start condition	none	Clock source 1/8 dividing	divided by 8
First transfer bit	MSB	SBT / SBO pin style	Nch open-drain
Input clock edge	falling edge	SBT pin pull-up resistor	Added
Output clock edge	rising edge	SBO pin pull-up resistor	Added
Clock	Internal clock	Serial 1 communication	Enable
		complete interrupt

An example setup procedure, with a description of each step is shown below.

Setup Procedure		Description
(1) Select the prescaler operation.	(1)	Set the PSCEN flag of the PSCMD register to
PSCMD (x'3F6F')		"1" to select "prescaler operation".
bp0 : PSCEN = 1
(2) Select the clock source.	(2)	Select the clcok source by the SC0CKS
SC0CKS (x'3F97')		register.
bp2-0 : SC0PSC2-0 = 100		Set bp4-0 to "0100" to select "fs/2".
(3) Select the used pin.	(2)	Set the SC0SEL flag of the SC0ODC register to
SC0ODC(x'3F96')		"0" to set I/O used pin to A (port 0).
bp7 : SC0SEL = 0
(4) Control the pin type.	(4)	Set the SC0ODC1-0 flag of the SC0ODC
SC0ODC(x'3F96')		register to "11" to select "N-ch open drain" to
bp1-0 : SC0ODC1-0 = 11		the SBO/SBT pin. Set the P0PLU5, 3 flag of
P0PLU (x'3F40')		the P0PLU register to "1" to add pull-up
bp5, 3 : P0PLU5, 3 = 1, 1		resistor.
(5) Control the pin direction.	5)	Set the P0DIR5-3 flag of the port 0 pin
P0DIR(x'3F30')		direction control register (P0DIR) to "101" to set
bp5-3 : P0DIR5-3 = 101		P03, P05 "output mode", and to set P04 "input
		mode".

Operation XI - 39