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(3) Register setting
When the device is used in the SBI mode, setting can be performed by means of the following two registers:
• Serial operating mode register (CSIM)
• Serial bus interface control register (SBIC)
(a) Serial operating mode register (CSIM)
When the SBI mode is used, CSIM is set as shown below (see 5.5.3 (1) "Serial operating mode register"
for full details of CSIM).
CSIM is manipulated by 8-bit manipulation instructions. Bit manipulation of bits 7, 6 and 5 is also possible.
Reset input clears the CSIM register to 00H.
The shaded area indicates bits used in the SBI mode.
Address
7
6
FE0H
CSIE
COI
Remarks
(R)
Read only
(W)
Write only
Serial clock selection bit (W)
CSIM1
0
1
Remarks
Figure in ( ) apply to f
Serial interface operating mode selection bit (W)
CSIM3
1
CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
5
4
3
WUP
0
CSIM3
Signal from Address Comparator (R)
Serial Interface Operation Enable/Disable Specification Bit (W)
Serial Clock
3-Wire Serial I/O Mode
Input clock to SCK pin from off chip
f
/2
4
(262 kHz)
XX
= 4.19 MHz operation
XX
Shift Register
Operating Mode
Bit Order
SIO
7 to 0
SBI mode
(MBS-first transfer)
2
1
0
0
CSIM1
0
Serial Clock Selection Bit (W)
Serial Interface Operating Mode Selection Bit (W)
Wake-up Functing Specification Bit (w)
SBI Mode
SO Pin Function
SB0/P02
XA
(N-ch open-drain
input/output)
Symbol
CSIM
SCK Pin Mode
Input
Output
SI Pin Function
P03 input
101
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