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15.6.2
Operation of Data Write Control Unit
The Data Write Control Unit is used to generate the write timing output (WTO) for
transferring data from the Output Data Buffer Register (OPDBR) to Output Data Register
(OPDR).
■ Operation of Data Write Control Unit
The Write Timing Output (WTO) can be generated by the following condition:
• After OPDBR0 is written by software.
• Triggered by the 16-bit reload timer 0 underflow.
• Triggered by the 16-bit reload timer 0 underflow. The 16-bit timer is started by the position detection
comparison circuit.
• Triggered by the position detection input (SNI2 to SNI0) (16-bit Reload timer 0 acts as a delay).
• Triggered either by the 16-bit reload timer 0 underflow, or by the position detection input.
At the mean time the cause of generation of WTO will be defined by setting different value of OPS2 to
OPS0 bit of the Output Control Register (OPCR: OPS2 to OPS0).
■ Signal Flow Diagram for OPDBR0 by Setting OPS2 to OPS0 = 000
Figure 15.6-5 Signal Flow Diagram for OPDBR0 (OPS2 to OPS0 = 000
16-BIT RELOAD TIMER 0
OPDBR0 WRITE SIGNAL
Pin
SNI2 to
SNI0
The write timing output signal is generated from the Data Write Control Unit whenever a value is written to
the OPDBR0 register, and the data in OPDBR0 is transferred to OPDR register one cycle later.
TIN
TIN0O
TOUT
WTIN0
OPDBR0W
POSITION
WTIN1
DETECTION
CHAPTER 15 MULTI-PULSE GENERATOR
DATA WRITE CONTROL UNIT
B
)
B
Pin
TIN0
TIN0
WRITE
WTO
TIMING
OUTPUT
401
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