12-3-4 Setup Example; Functions - Panasonic F77G User Manual

Chapter 12 Serial Interface 3

12-3-4 Setup Example

Master Transmission Setup Example
Here is the setup example for the transmission of the plural data to the all devices on IIC bus with IIC
interface function of serial 3. Figure 12-3-15 shows the conditions.
Figure 12-3-15
Item
SBI3/SBO3 pins
Transfer bit count
Start condition
First transfer bit
ACK bit
An example setup procedure, with a description of each step is shown below.
Setup Procedure
(1) Select prescaler operation.
PSCMD (x'3F6F')
bp0 : PSCEN = 1
(2) Select the clock source.
SC2CKS (x'3FAF')
bp2-0 : SC3PSC2-0 = 100
bp3 = 0
(3) Control the pin type.
SC3ODC (x'3FAE')
bp1-0 : SC3ODC1-0 = 11
P5PLU (x'3F45')
bp2-1 : P5PLU2-1 = 1, 1
(4) Control the pin direction.
P5DIR (x'3F35')
bp2-1 : P5DIR2-1 = 1, 1
XII - 36
Operation
Conditions Single Master IIC Communication Setup
Set to
Connection
Clock source
(with 2 lines)
8 bits SCL/SDA pin's type
enable Pull-up resistance of SCL pin
MSB Pull-up resistance of SDA pin
enable
(1)
(2)
(3)
(4)
Item
fs/2
N-ch open-drain
added
added
Description
Set the PSCEN flag of the PSCMD register to "1"
to select prescaler operation.
Set the SC3PSC2-0 flag of the SC3CKS register
to "100" to select fs/2 at clock source.
Set bp3 of the SC3CKS register to "0", always.
Set the SC3ODC1, 0 flag of the SC3ODC register
to "11" to select N-ch open drain for the SDA/
SCL pin type. Set the P5PLU2-1 flag of the
P5PLU register to "1, 1" to add pull-up resistor.
Set the P5DIR2-1 flag of P5 pin control direction
register (P3DIR) to "1, 1" to set P52, P51, to
output mode.
Set to