Fujitsu MB90460 Series, Hardware Manual, Page: 377 / 739

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CHAPTER 15 MULTI-PULSE GENERATOR
Figure 15.1-2 PPG Falling Edge Synchronization
Note:
Switch from one PPG synchronization mode to another PPG synchronization mode (e.g. from rising-
edge synchronization to falling-edge synchronization or vice versa) is inhibited, no synchronization
mode must be the transit for such switch.
●
Input Position Detect Control
The input signal at the Multi-pulse Generator input pins (SNI2 to SNI0) is used to detect the rotor position
of the DC motor. There is a Noise Filter for all SNI2 to SNI0 input and Table 15.1-2 shows the noise width
for noise filter of SNI2 to SNI0 pins. The followings are conditions for the input position detect circuit:
• 3 edge selection for all SNI2 to SNI0; Rising edge, falling edge and both edges.
• Compare the levels of SNI2 to SNI0 inputs with RDA2 to RDA0 bits of Output Data Register (OPDR:
RDA2 to RDA0).
After above condition met, the writing timing signal will be generated for the data transfer between
OPDBR registers and OPDR register.
Furthermore, the edge detection for individual input (SNI2 to SNI0) can be disable/enable.
OP4’
OP5’
OP4
OP5
PPG
Asynchronous State Change
Synchronous State Change
Sequencer changes
state due to, e.g. the
Glitch
reload timer 0 underflow.
WTS1,WTS0 = 00
B
WTS1,WTS0 = 10
B