Fujitsu 8FX User Manual

MB95630H Series
380 FUJITSU SEMICONDUCTOR LIMITED MN702-00009-2v0-E
CHAPTER 21 MULTI-PULSE GENERATOR
21.1 Overview
Figure 21.1-2 PPG Falling Edge Synchronization
Note:
Directly changing from one PPG synchronization mode to another PPG synchronization
mode (e.g. from rising-edge synchronization to falling-edge synchronization or vice versa)
is prohibited. To change from one PPG synchronization mode to another PPG
synchronization mode, disable PPG edge synchronization temporarily before changing to
another PPG synchronization mode.
● 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
21.1-2 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 RDA[2:0] bits in the output data register
upper (OPDUR:RDA[2:0]).
After above condition met, the writing timing signal will be generated for the data transfer
between the OPDBRHx and OPDBRLx registers and the OPDUR and OPDLR registers.
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
Glitch
WTS[1:0] = 0b00
WTS[1:0] = 0b10
The sequencer changes its
state (e.g. due to a reload
timer underflow).

Fujitsu 8FX Specifications

General

Brand	Fujitsu
Model	8FX
Category	Computer Hardware
Language	English