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Field
Name
R/W
Description
14:6
PLL1A
R/W
PLL Multiplication Factor A
It is used to calculate VCO frequency. The calculation formula is f
(
VCO
output)= f
(
VCO input)×PLL1A, and the formula is established only when
PLL1A is 50~432.
000000000: PLLA=0 (error)
000000001: PLLA=1 (error)
……
000110010
:
PLLA=50
……
110110000
:
PLLA=432
110110001: PLLA=433 (error)
……
111111111: PLLA=511 (error)
17:16
PLL1C
R/W
Division Factor C
It is used to calculate the output clock frequency of PLL1.
00
:
PLL1C=2
01
:
PLL1C=4
10
:
PLL1C=6
11
:
PLL1C=8
Note: This bit can be written only when PLL1 is disabled.
21:18
Reserved
22
PLLCLKS R/W
PLL Clock Source
This bit can be set or cleared by software and be used to select the
clock source of PLL1 and PLL2.
0: HSICLK is used as clock source
1: HSECLK is used as clock source
Note: This bit can be written only when PLL1 and PLL2 are disabled.
23
Reserved
27:24
PLLD
R/W
Division Factor
It is used to calculate the clock frequency of OTG_FS, RNG and SDIO.
0000: PLLD=0 (error)
0001: PLLD=1 (error)
0010
:
PLLD=2
0011
:
PLLD=3
0100
:
PLLD=4
……
1111
:
PLLD=15
31:28
Reserved
Clock configuration register (RCM_CFG)
Offset address: 0x08
Reset value: 0x0000 0000
All bits of this register are set or cleared by software.
Access: Access in the form of word, half word and byte, with 0 to 2 wait cycles.
1 or 2 wait cycles are inserted only when the access occurs during clock
switching.