396
CHAPTER 18 SERIAL INTERFACE CHANNEL 0 (
µ
PD78078Y Subseries)
<6>
<5>
<4>
<3>
<2>
<1>
<0>
<7>
Symbol
SBIC
BSYE ACKD ACKE
FF61H 00H R/W
Note1
Address After Reset R/W
ACKT CMDD RELD CMDT RELT
(b) Serial bus interface control register (SBIC)
SBIC is set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets SBIC to 00H.
R/W
RELT
Use for stop condition output. When RELT = 1, SO0 latch is set to 1. After SO0 latch setting, automatically cleared to
0. Also cleared to 0 when CSIE0 = 0.
R/W
CMDT
Use for start condition output. When CMDT = 1, SO0 latch is cleared to 0. After clearing SO0 latch, automatically
cleared to 0. Also cleared to 0 when CSIE0 = 0.
R
RELD
Stop Condition Detection
0
Clear Conditions
• 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
1
Setting Condition
• When stop condition is detected
R
CMDD
Start Condition Detection
0
Clear Conditions
• When transfer start instruction is executed
• When stop condition is detected
• When CSIE0 = 0
• When RESET input is applied
1
Setting Condition
• When start condition is detected
R/W
ACKT
SDA0 (SDA1) is set to low after the Set instruction execution (ACKT = 1) before the next SCL falling edge. Used for
generating an ACK signal by software if the 8-clock wait mode is selected. Cleared to 0 if CSIE = 0 when a transfer by
the serial interface is started.
R/W
ACKE
Acknowledge Signal Automatic Output Control
Note 2
0
Disabled (with ACKT enabled). Used when receiving data in the 8-clock wait mode or when transmitting data.
Note 3
1
Enabled.
After completion of transfer, acknowledge signal is output in synchronization with the 9th falling edge of SCL clock
(automatically output when ACKE = 1). However, not automatically cleared to 0 after acknowledge signal output.
Used for reception when the 9-clock wait mode is selected.
R
ACKD
Acknowledge Detection
0
Clear Conditions
• When transfer start instruction is executed
• When CSIE0 = 0
• When RESET input is applied
1
Set Conditions
• When acknowledge signal is detected at the rising edge of SCL clock after completion of transfer
R/W
BSYE
Control of N-ch Open-Drain Output for Transmission in I
2
C Bus Mode
Note 5
Note 4
0
Output enabled (transmission)
1
Output disabled (reception)
Notes 1. Bits 2, 3, and 6 (RELD, CMDD, ACKD) are read-only bits.
2. This setting must be performed prior to transfer start.
3. In the 8-clock wait mode, use ACKT for output of the acknowledge signal after normal data reception.
4. The busy mode can be released by the start of a serial interface transfer or reception of an address
signal. However, the BSYE flag is not cleared.
5. When using the wake-up function, set BSYE to 1.
Remark
CSIE0 : Bit 7 of serial operating mode register 0 (CSIM0)
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