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CHAPTER 15 SERIAL INTERFACE CHANNEL 0 (
µ
PD78014 Subseries)
274
Figure 15-5. Serial Operating Mode Register 0 Format (2/2)
Note
When CSIE0 = 0, COI becomes 0.
(3) Serial bus interface control register (SBIC)
This register sets serial bus interface operation and displays status.
SBIC is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets SBIC to 00H.
Figure 15-6. Serial Bus Interface Control Register Format (1/2)
R/W
RELT
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.
R/W
CMDT
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.
R
RELD
Bus Release Detection
Clear Conditions (RELD = 0)
Set Conditions (RELD = 1)
• When transfer start instruction is executed
• When bus release signal (REL) is detected
• If SIO0 and SVA values do not match in address
reception
• When CSIE0 = 0
• When RESET input is applied
Symbol
<7>
<6>
<5>
<4>
<3>
<2>
<1>
<0>
Address
When Reset
R/W
SBIC
BSYE
ACKD
ACKE
ACKT
CMDD
RELD
CMDT
RELT
FF61H
00H
R/W
Note
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)
R
COI
Slave Address Comparison Result Flag
Note
0
Slave address register (SVA) not equal to serial I/O shift register 0 (SIO0) data
1
Slave address register (SVA) equal to serial I/O shift register 0 (SIO0) data
R/W
CSIE0
Serial Interface Channel 0 Operation Control
0
Operation stopped
1
Operation enabled
Содержание 78014Y Series
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