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M16C6KA_15 Datasheet, PDF (170/270 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER Description
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M16C/6KA Group
MULTI-MASTER I2C-BUS Interface
•Bits 2, 3 : Port function selection bits PED, PEC
When ES0 bit of I2C control register 0 is set to “1”, P61/P63/P77 and P60/P62/P76 function as SCL and SDA
respectively. However, if PED is set to “1”, SDA functions as output port so as to SCL if PEC is set to “1”. In this
case, if “0” or “1” is written to the port register, the data can be output on to the I2C-BUS regardless of the
internal SCL/SDA output signals. The functions of SCL/SDA are returned back by setting PED/PEC to “1”
again.
If the ports are set in input mode, the values on the I2C-BUS can be known by reading the port register
regardless of the values of PED and PEC.Table GC-4 shows the port specification.
Table.GC-4 Ports specifications
Pin name
P60/P62/P76
ES0 bit
0
1
1
PED bit
-
0
1
P61/P63/P77
ES0 bit
0
1
PEC bit
-
0
1
1
P6/P7 port
direction register
0/1
-
-
P6/P7 port
direction register
0/1
-
Function
Port I/O function
SDA I/O function
SDA input function, port output function
Function
Port I/O function
SCL I/O function
-
SCL input function, port output function
•Bits 4, 5 : SDA/SCL logic output value monitor bits SDAM /SCLM
It is possible to monitor the logic value of the SDA and SCL output signals from I2C-BUS interface circuit.
SDAM can monitor the output logic value of SDA. SCLM can monitor the output logic value of SCL. The bits are
read-only. Write “0” if in writing (Writing “1” is reserved)
•Bits 6, 7 : I2C system clock selection bits ICK0, ICK1
These bits select the basic operation clock of I2C-BUS interface circuit. It is possible to select I2C system
clock VIIC among 1/2,1/4 and 1/8 of main clock f(XIN) and 1/2 of external I2C clock (ICCK)
Table.GC-5 I2C system clock selecting bits
ICK1
ICK0
I2C system clock
0
0
VIIC = 1 / 2f1
0
1
VIIC = 1 / 4f1
1
0
VIIC = 1 / 8f1
1
1
VIIC = 1 / 2ICCK
Note: f1 = f(XIN)
ICCK = External I2C clock
Rev.1.00 Jul 16, 2004 page 168 of 266
REJ03B0100-0100Z
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