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CHAPTER 9 12-BIT PPG TIMER
9.2 Configuration of 12-bit PPG Timer Circuit
The 12-bit PPG timer comprises the following seven blocks:
• Count clock selector
• 12-bit counter
• Comparator
• 12-bit PPG control register 1 (RCR21)
• 12-bit PPG control register 2 (RCR22)
• 12-bit PPG control register 3 (RCR23)
• 12-bit PPG control register 4 (RCR24)
■ Block Diagram of 12-bit PPG Timer
Figure 9.2-1 Block Diagram of 12-bit PPG Timer
: Instruction cycle
RCK1 RCK0 HSC5 HSC4 HSC3 HSC2 HSC1
HSC0
HSC11 HSC10 HSC9
HSC8 HSC7
HSC6
SCL11 SCL10
SCL9
SCL8 SCL7 SCL6
RCEN
SCL5
SCL4 SCL3 SCL2 SCL1 SCL0
CLK
2
4
16
256
12
12
1t
INST
RCR21
RCR22
RCR24
RCR23
t
INST
Internal data bus
Count
clock
selector
12-bit counter
Clear
Comparator
Compare value for "H" width
P37/BZ/PPG pin
Compare value for cycle period
Internal data bus