NEC 78014Y Series, User Manual

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CHAPTER 16 SERIAL INTERFACE CHANNEL 0 (
µ
PD78014Y Subseries)
335
R/W ACKE Acknowledge Signal Automatic Output Control (in SBI mode)
0 Acknowledge signal automatic output disable (output with ACKT enable)
1 Before completion Acknowledge signal is output in synchronization with the 9th clock falling edge of
of transfer SCK0 (automatically output when ACKE = 1).
After completion Acknowledge signal is output in synchronization with the falling edge of SCK0 clock
of transfer immediately after execution of the instruction to be set to 1 (automatically output when
ACKE = 1). However, not automatically cleared to 0 after acknowledge signal output.
R/W ACKE Acknowledge Signal Automatic Output Control
Note 1
(in the I
2
C bus mode)
0 Disables acknowledge signal automatic output. (However, output with ACKT possible)
Use for reception when 8-clock wait mode is selected or for transmission Note 2 .
1 Enables acknowledge signal automatic output.
Outputs acknowledge signal in synchronization with the 9th clock falling edge of SCL (automatically output
when ACKE = 1). However, not automatically cleared to 0 after acknowledge signal output.
Used in reception with 9-clock wait mode selected.
R ACKD Acknowledge Detection
Clear Conditions (ACKD = 0) Set Conditions (ACKD = 1)
• At the falling edge of SCK0 clock immediately after the • When acknowledge signal is detected at the rising
busy mode has been released when a transfer start edge of SCK0/SCL clock after completion of transfer
instruction is executed
• Upon execution of transfer start instruction in the I 2 C
bus mode
• When CSIE0 = 0
• When RESET input is applied
R/W
Note 3
Synchronizing Busy Signal Output Control
BSYE
0 When the SBI mode is used, disables busy signal which is output in synchronization with the falling edge of
SCK0 clock immediately after
execution of the instruction to be cleared to 0. Be sure to set BSYE
to 0 in the I 2 C bus mode.
1 Outputs busy signal at the falling edge of SCK0 clock following the acknowledge signal when the SBI mode
is used.
Figure 16-7. Serial Bus Interface Control Register Format (2/2)
Notes 1. Setting should be performed before transfer.
2. If 8-clock wait mode is selected, the acknowledge signal at reception time must be output using ACKT.
3. The busy mode can be cancelled by start of serial interface.
However, the BSYE flag is not cleared to 0.
Remark CSIE0: Bit 7 of the serial operating mode register 0 (CSIM0)