STM32W108CBU61TR STMicroelectronics, STM32W108CBU61TR Datasheet - Page 41

• Manufacturer Part Number: STM32W108CBU61TR
• Description: 16/32-BITS MICROS
• Manufacturer: STMicroelectronics
• Series: STM32r

Specifications of STM32W108CBU61TR

• Applications: RF4CE, Remote Control
• Core Processor: ARM® Cortex-M3™
• Program Memory Type: FLASH (128 kB)
• Controller Series: STM32W
• Ram Size: 8K x 8
• Interface: I²C, SPI, UART/USART
• Number Of I /o: 24
• Voltage - Supply: 1.18 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-VFQFN Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

STM32W108CB, STM32W108HB
6.3.6
31
15
31
15
30
14
30
14
In addition to these modes, further automatic control is invoked by hardware when flash
programming is enabled. To ensure accuracy of the flash controller's timers, the FCLK
frequency is forced to 12 MHz during flash programming and erase operations.
Table 4.
Clock switching registers
XTAL or OSCHF main clock select register (OSC24M_CTRL)
Address offset: 0x4000 401C
Reset value: 0x0000 0000
CPU clock source select register (CPU_CLK_SEL)
Address offset: 0x4000 4020
Reset value: 0x0000 0000
Bit 1 OSC24M_EN: When set to ‘1’, 24 MHz crystal oscillator is main clock.
Bit 0 OSC24M_SEL: When set to ‘0’, OSCHF is selected. When set to ‘1’, XTAL is selected.
OSC24M_SEL CPU_CLK_SEL
1 (OSC24M)
1 (OSC24M)
29
13
29
13
0 (OSCHF)
0 (OSCHF)
28
12
28
12
System clock modes
27
11
27
11
0 (Normal CPU)
0 (Normal CPU)
1 (Fast CPU)
1 (Fast CPU)
26
10
26
10
25
25
9
9
Reserved
Doc ID 16252 Rev 8
Rserved
24
24
8
8
12 MHz
12 MHz
24 MHz
24 MHz
SCLK
Reserved
Reserved
23
7
23
7
22
6
22
6
12 MHz
12 MHz
6 MHz
6 MHz
PCLK
21
5
21
5
20
4
20
4
Erase Inactive
Program/
12 MHz
12 MHz
24 MHz
6 MHz
Flash
19
3
19
3
System modules
18
2
18
f
2
CLK
Erase Active
OSC24
Program/
M_EN
17
12 MHz
12 MHz
12 MHz
12 MHz
1
rws
17
Flash
1
LK_SEL
CPU_C
41/209
OSC24
M_SEL
rws
16
rws
0
16
0