368
CHAPTER 17 SERIAL INTERFACE CHANNEL 0 (
µ
PD78058FY SUBSERIES)
(3) Register setting
The I
2
C bus mode is set by the serial operating mode register 0 (CSIM0), serial bus interface control
register (SBIC), and interrupt timing specify register (SINT).
(a) Serial operating mode register 0 (CSIM0)
CSIM0 is set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets 00H.
R/W
CSIM01
CSIM00
Serial Interface Channel 0 Clock Selection
0
×
Input clock from off-chip to SCL pin
1
0
8-bit timer register 2 (TM2) output
Note 2
1
1
Clock specified with bits 0 to 3 of timer clock select register 3 (TCL3)
R/W
CSIM CSIM
CSIM PM25 P25 PM26 P26 PM27 P27 Operation
Start
SI0/SB0/SDA0/
SO0/SB1/SDA1/ SCK0/SCL/P27
04
03
02
Mode
Bit
P25 Pin Function P26 Pin Function Pin Function
0
×
3-wire serial I/O mode (see section 17.4.2 3-wire serial I/O mode operation.)
1
1
0
×
×
0
0
0
1
2-wire
MSB
P25
SB1/SDA1
SCK0/SCL
Note 3 Note 3
serial I/O or
(CMOS I/O)
N-ch open-
N-ch open-
I
2
C bus mode
drain I/O
drain I/O
1
1
1
0
0
× ×
0
1
2-wire
MSB
SB0/SDA0
P26
SCK0/SCL
Note 3 Note 3
serial I/O or
N-ch open-
(CMOS I/O)
N-ch open-
I
2
C bus mode
drain I/O
drain I/O
R/W
WUP
Wake-up Function Control
Note 4
0
Interrupt request signal generation with each serial transfer in any mode
1
In I
2
C bus mode, interrupt request signal is generated when the address data received after start condition
detection (when CMDD = 1) matches data in slave address (SVA) register.
R
COI
Slave Address Comparison Result Flag
Note 5
0
Slave address register (SVA) not equal to data in serial I/O shift register 0 (SIO0)
1
Slave address register (SVA) equal to data in serial I/O shift register 0 (SIO0)
R/W
CSIE0
Serial Interface Channel 0 Operation Control
0
Stops operation.
1
Enables operation.
Notes 1. Bit 6 (COI) is a read-only bit.
2. In the I
2
C bus mode, the clock frequency is 1/16 of the clock frequency output by TO2.
3. Can be used freely as a port.
4. To use the wake-up function (WUP = 1), set the bit 5 (SIC) of the interrupt timing specify register (SINT)
to 1. Do not execute an instruction that writes the serial I/O shift register 0 (SIO0) while WUP = 1.
5. When CSIE0 = 0, COI is 0.
Remark
×
: don’t care
PMXX : Port Mode Register
PXX
: Port Output Latch
6
5
4
3
2
1
0
7
Symbol
CSIM0
FF60H 00H R/W
Note 1
Address After Reset R/W
CSIE0 COI
WUP
CSIM04 CSIM03 CSIM02 CSIM01 CSIM00
Содержание PD78056F
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