Table of Contents
Advertisement
(a) Serial operating mode register (CSIM)
When the 3-wire serial I/O 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 memory 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 3-wire serial I/O mode.
Address
7
6
FE0H
CSIE
C0I
Remarks
(R)
Read only
(W)
Write only
Serial clock selection bit (W)
CSIM1
0
1
Remarks
Figuer in ( ) apply to f
Serial interface operating mode selection bit (W)
CSIM3
Operating Mode
3-wire serial I/O
0
mode
Wake-up function specification bit (W)
WUP
0
CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
5
4
3
WUP
0
CSIM3
Match 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 Bit Order
SIO
7 to 0
(MSB-fist transfer)
IRQCSI set at end of every serial transfer.
2
1
0
0
CSIM1
0
Serial Clock Selection Bit (W)
Serial Interface Operating Mode Selection Bit (W)
Wake-up Function Specification Bit (w)
SBI Mode
SO Pin Function
XA
SO/P02
(CMOS Output)
Symbol
CSIM
SCK Pin Mode
Input
Output
Si Pin Function
SI/P03 (Input)
85
Advertisement
Table of Contents
