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Chapter 40 Pulse Frequency Modulator
1.PFM Overview
■ Block Diagram of the 16-Bit Pulse Frequency Modulator
Figure 1-2 Block Diagram of the 16-bit Pulse Frequency Modulator
Clear
prescaler
Internal clock
16
R-BUS
Reload
8
16
3
φφφφφ
2
1
2
3
2
5
2
6
2
7
GATE
CSL2
CSL1
RELD
–
–
INTE
UF
CNTE
TRG
16-bit down-counter
Clock selector
16-bit reload register
UF
16
Reload
8
16
GATE
RELD
–
–
INTE
UF
CNTE
TRG
IRQ
16-bit down-counter
16-bit reload register
UF
CSL0
Clear
prescaler
Internal clock
3
φφφφφ
2
1
2
3
2
5
2
6
2
7
CSL2
CSL1
Clock selector
CSL0
Pulse Gen.
OUT
INV