SN32F280 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 61
Version 1.1
2:0
MSEL[2:0]
Feedback divider value.
000: M = 4
001: M = 6
010: M = 8
011: M = 10
100: M = 12
Other: Reserved
R/W
0
To select the appropriate values for M and P, it is recommended to follow these constraints:
1.
10MHz ≤ F
CLKIN
≤ 25MHz
2. 96
MHz ≤ F
VCO
3. M = 4, 6, 8, 10, or 12
4. P = 2, or 4
(duty 50% +/- 2.5%)
5. F
CLKOUT
= 30MHz, 50MHz, 60MHz, 24MHz, 36MHz, 48MHz, 72MHz, 64MHz
with jitter < ±500 ps
3.3.2.1
RECOMMEND FREQUENCY SETTING
F
VCO
= F
CLKIN
* M
F
CLKOUT
= F
VCO
/ P
F
CLKIN
(MHz)
MSEL[2:0]
M
F
VCO
(MHz)= F
CLKIN
*M
96 MHz
PSEL
P
F
CLKOUT
(MHz)
= F
VCO
/P
12
010b
8
96
0
2
48
16
001b
6
96
0
2
48
3.3.3 Clock Source Status register (SYS0_CSST)
Address Offset: 0x08
Bit
Name
Description
Attribute
Reset
31:7
Reserved
R
0
6
PLLRDY
PLL clock ready flag
0: PLL unlocked
1: PLL locked
R
0
5
Reserved
R
0
4
EHSRDY
External high-speed clock ready flag
0: EHS oscillator not ready
1: EHS oscillator ready
R
0
3
Reserved
R
0
2
ELSRDY
External low-speed clock ready flag
0: ELS oscillator not ready
1: ELS oscillator ready
R
0
1
Reserved
R
0
0
IHRCRDY
IHRC ready flag
0: IHRC not ready
1: IHRC ready
R
1
3.3.4 System Clock Configuration register (SYS0_CLKCFG)
Address Offset: 0x0C
Содержание SN32F280 Series
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