Setup Example Of The Slave Iic Serial Interface - Panasonic F77G User Manual

13-3-1

Setup Example of the Slave IIC Serial Interface

Setup Example of the Data Transmission
This section describes the setup example of slave transmission using serial interface 4.
Table 13-3-2 shows the conditions for transmission routine.
An example setup procedure, with a description of each step is shown below.
Setup Procedure
(1) Control the pin type.
SC4ODC0 (x'3F3F')
bp1-0
P0PLU (x'3F40')
bp2-1
(2) Control the pin direction.
P0DIR (x'3F30')
bp2-1
(3) Communication pin, Communica-
tion mode, address mode selection
SC4AD1 (x'3FA4')
bp4
bp3
bp2
(4) Serial interface 4 actication
SC4AD1 (x'3FA4') : SELI2C = 1
Table 13-3-2
Data pin (SDA)
Clock pin (SCL)
Addressing mode
Slave address
Transmission data
: SC4ODC01-00 = 11
: P0PLU2-1 = 11
: P0PLU2-1 = 11
: I2CPSEL = 1
: I2CGEM = 0
: I2CADM = 0
Pin Setup
Item
(1) Set the SC4ODC01-0 flag of the SC4ODC0
register to "1" to select N-ch open drain for P01
and P02.
Set the P0PLU2-1 flag of the P0PLU register to
"1" to add pull-up resistor.
(2) Set the P0PLU2-1 flag of the port 0 pin direc-
tion control register (P0DIR) to "1" to set P01
and P02 to output mode.
(3) Set the I2CPSEL flag of the SC4AD1 register
to "1" to select P01 and P02 for communication
pins.
Set the I2CGEM flag to "0" to select normal
communication mode, and set the I2CADM
flag to "0" to select 7 bits adddress mode.
(4) Set the SELI2C flag of the SC4AD1 register
to "1" to activate the serial interface.
Chapter 13
Setup
P01
P02
7 bits
110011
x'55'
Description
Operation
Serial Interface 4
XIII - 11