NEC 78014Y Series User Manual page 384

(3) Register setting
2
The I C bus mode setting is performed by the serial operating mode register 0 (CSIM0), the serial bus interface
control register (SBIC), and the 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.
Symbol <7>
CSIM0 CSIE0
R/W CSIM01 CSIM02 Serial Interface Channel 0 Clock Selection
0
1
1
R/W
CSIM CSIM CSIM PM25 P25 PM26 P26 PM27 P27
04 03
×
0
1 0
1 1
www.DataSheet4U.com
Notes 1. Bit 6 (COI) is a Read-Only bit.
2. When the I
3. Can be used freely as a port.
×
Remark
PM××: Port mode register
P×× : Output latch of port
384
CHAPTER 16 SERIAL INTERFACE CHANNEL 0 ( µ PD78014Y Subseries)
<6> <5> 4 3
COI WUP CSIM04 CSIM03 CSIM02 CSIM01 CSIM00
×
Input clock to SCK0 pin from off-chip
0 8-bit timer register 2 (TM2) output
1 Clock specified with bits 0 to 3 of timer clock select register 3 (TCL3)
02
3-wire serial I/O mode (Refer to 16.4.2 3-wire serial I/O mode operation)
SBI mode (Refer to 16.4.3 SBI mode operation)
Note 3 Note 3
× ×
0 0 0 0
Note 3 Note 3
× ×
1 0 0 0
2
C bus mode is used, the clock frequency is 1/16 of the clock frequency output by TO2.
: don't care
2 1 0 Address
FF60H
Note 2
Operating Start Bit
Mode
2-wire serial MSB
1 I/O mode
or I 2 C
bus mode
1
When Reset R/W
Note 1
00H R/W
SI0/SB0/SDA0/ SO0/SBI/SDA1/
P25 Pin Function P26 Pin Function
P25 SB1/SDA1
(CMOS (N-ch open-drain (N-ch open-
input/output) input/output)
SB0/SDA0 P26
(N-ch open-drain (CMOS
input/output) input/output)
SCK0/SCL/
P27 Pin Function
SCK0/SCL
drain
input/output)