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CHAPTER 15 SERIAL INTERFACE CHANNEL 0 (
µ
PD78014 Subseries)
293
(b) Serial bus interface control register (SBIC)
SBIC is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets SBIC to 00H.
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
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 (only if WUP = 1)
• When CSIE0 = 0
• When RESET input is applied
R
CMDD
Command Detection
Clear Conditions (CMDD = 0)
Set Conditions (CMDD = 1)
• When transfer start instruction is executed
• When command signal (CMD) is detected
• When bus release signal (REL) is detected
• When CSIE0 = 0
• When RESET input is applied
R/W
ACKT
Acknowledge signal is output in synchronization with the falling edge clock of SCK0 just after execution of
the instruction to be set to 1, and after acknowledge signal output, automatically cleared to 0. Used as ACKE = 0
Also cleared to 0 upon start of serial interface transfer or when CSIE0 = 0.
(continued)
Note
Bits 2, 3, and 6 (RELD, CMDD and ACKD) are Read-Only bits.
Remarks
1. Zeros will be returned from bits 0, 1, and 4 (or RELT, CMDT, ACKT, respectively) if users read these
bits after data setting is completed.
2. CSIE0: Bit 7 of the serial operating mode register 0 (CSIM0)
Содержание 78014Y Series
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