Datasheet

Table Of Contents
STM32F105xx, STM32F107xx Application block diagrams
Doc ID 15274 Rev 6 97/104
Tabl e 6 4 give the I
DD
run mode values that correspond to the conditions specified in
Tabl e 6 3.
Table 63. PLL configurations
Application
Crystal
value in
MHz
(XT1)
PREDIV2 PLL2MUL PLLSRC PREDIV1 PLLMUL
USB
prescaler
(PLLVCO
output)
PLL3MUL
I2Sn
clock
input
MCO (main
clock
output)
Ethernet only 25 /5
PLL2ON
x8
PLL2 /5 PLLON x9 NA
PLL3ON
x10
NA
XT1 (MII)
PLL3 (RMII)
Ethernet + OTG 25 /5
PLL2ON
x8
PLL2 /5 PLLON x9 /3
PLL3ON
x10
NA
XT1 (MII)
PLL3 (RMII)
Ethernet + OTG
+ basic audio
25 /5
PLL2ON
x8
PLL2 /5 PLLON x9 /3
PLL3ON
x10
PLL
XT1 (MII)
PLL3 (RMII)
Ethernet + OTG
+ Audio class
I
2
S
(1)
14.7456 /4
PLL2ON
x12
PLL2 /4
PLLON
x6.5
/3
PLL3ON
x20
PLL3
VCO
Out
NA
ETH PHY
must use its
own crystal
OTG only 8 NA PLL2OFF XT1 /1 PLLON x9 /3 PLL3OFF NA NA
OTG + basic
audio
8 NA PLL2OFF XT1 /1 PLLON x9 /3 PLL3OFF PLL NA
OTG + Audio
class I
2
S
(1)
14.7456 /4
PLL2ON
x12
PLL2 /4
PLLON
x6.5
/3
PLL3ON
x20
PLL3
VCO
Out
NA
Audio class I
2
S
only
(1)
14.7456 /4
PLL2ON
x12
PLL2 /4
PLLON
x6.5
NA
PLL3ON
x20
PLL3
VCO
out
NA
1. SYSCLK is set to be at 72 MHz except in this case where SYSCLK is at 71.88 MHz.