CHAPTER 14 SERIAL INTERFACE CHANNEL 0
198
R/W
Use for bus release signal output.
When RELT = 1, SO latch is set to 1. After SO latch setting, automatically cleared to 0.
Also cleared to 0 when CSIE0 = 0.
RELT
R/W
Use for command signal output.
When CMDT = 1, SO latch is cleared to (0). After SO latch clearance, automatically cleared to (0).
Also cleared to (0) when CSIE0 = 0.
CMDT
R
RELD
Bus Release Detection
Clear Conditions (RELD = 0)
Set Conditions (RELD = 1)
When transfer start instruction is executed
If SIO0 and SVA values do not match in address
reception
When CSIE0 = 0
When RESET input is applied
When bus release signal (REL) is detected
R
CMDD
Command Detection
Clear Conditions (CMDD = 0)
Set Conditions (CMDD = 1)
When transfer start instruction is executed
When bus release signal (REL) is detected
When CSIE0 = 0
When RESET input is applied
When command signal (CMD) is detected
R/W
Acknowledge signal is output in synchronization with the falling edge clock of SCK0 just after execu-
tion of the instruction to be set to 1, and after acknowledge signal output, automatically cleared to 0.
Also cleared to 0 upon start of serial interface transfer or when CSIE0 = 0.
ACKT
Note
Bits 2, 3 and 6 (RELD, CMDD and ACKD) are Read-Only bits.
Remark
CSIE0: Bit 7 of the serial operating mode register 0 (CSIM0)
Figure 14-3. Serial Operating Mode Register 0 Format (2/2)
R
COI
Slave Address Comparison Result Flag
Note
0
Slave address register not equal to serial I/O shift register 0 data
1
Slave address register equal to serial I/O shift register 0 data
R/W
CSIE0
Serial Interface Channel 0 Operation Control
0
Operation stopped
1
Operation enable
Note
COI becomes 0 when CSIE0 = 0.
(3) Serial bus interface control register (SBIC)
This register sets serial bus interface operation and displays statuses.
SBIC is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input clears SBIC to 00H.
Figure 14-4. Serial Bus Interface Control Register Format (1/2)
6
5
4
3
2
1
0
7
Symbol
SBIC
BSYE ACKD ACKE ACKT CMDD RELD CMDT RELT
FF61H 00H R/W
Note
Address After Reset R/W