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Chapter 14 PLL Interface
1.Overview
Chapter 14 PLL Interface
1. Overview
• This blockdiagram (simplified) shows the integration of the PLL and the PLL Interface with the multiplier
control logic (1/M, 1/N for basic frequency multiplication and 1/G for clock auto gear).
2. Features
• Free programmable divide-by-M counter in the range of 1..16
• Free programmable divide-by-N counter in the range of 1..64
• Clock auto gear up/down function to prevent voltage drops and surges
3. Frequency calculation
• CLKB frequency is determined by :
f(CLKB) = [ Main-Osc * (PLLDIVM_DVM+1) *( PLLDIVN_DVN+1) ] / [ (PLLDIVM_DVM+1) * (DIVR0_B+1) ]
• CLKP frequency is determined by :
f(CLKP) = [ Main-Osc * (PLLDIVM_DVM+1) *( PLLDIVN_DVN+1) ] / [ (PLLDIVM_DVM+1) * (DIVR0_P+1) ]
• CLKT frequency is determined by :
f(CLKT) = [ Main-Osc * (PLLDIVM_DVM+1) *( PLLDIVN_DVN+1) ] / [ (PLLDIVM_DVM+1) * (DIVR1_T+1) ]
X
FB
1/M
1/N
Clock Unit
XIN1
PLLIN
FB1 delay
Clocktree
Phase
Correction
1/G
CK
CLKB
CLKP
CLKT
MAIN
Osc.
PLL
Interface
M
U
X
M
U
X
PLL
CPU-Core
Resources
Ext Bus