STR910FM32X6T STMICROELECTRONICS [STMicroelectronics], STR910FM32X6T Datasheet - Page 15

• Manufacturer Part Number: STR910FM32X6T
• Description: ARM966E-S 16/32-Bit Flash MCU with Ethernet, USB, CAN, AC Motor Control, 4 Timers, ADC, RTC, DMA
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

STR91xF
2.10.2 Reference clock (RCLK)
2.10.3 AHB clock (HCLK)
2.10.4 APB clock (PCLK)
2.10.5 Flash memory interface clock (FMICLK)
2.10.6 Baud rate clock (BRCLK)
Figure 2.
The main clock (f
for the ARM core and all the peripherals. The RCLK provides the divided clock for the ARM
core, and feeds the dividers for the AHB, APB, External Memory Interface, and FMI units.
The RCLK can be divided by 1, 2 or 4 to generate the AHB clock. The AHB clock is the bus
clock for the AHB bus and all bus transfers are synchronized to this clock. The maximum HCLK
frequency is 96MHz.
The RCLK can be divided by 1, 2, 4 or 8 to generate the APB clock. The APB clock is the bus
clock for the APB bus and all bus transfers are synchronized to this clock. Many of the
peripherals that are connected to the AHB bus also use the PCLK as the source for external
bus data transfers. The maximum PCLK frequency is 48MHz.
The FMICLK clock is an internal clock derived from RCLK, defaulting to RCLK frequency at
power up. The clock can be optionally divided by 2. The FMICLK determines the bus bandwidth
between the ARM core and the Flash memory. Typically, codes in the Flash memory can be
fetched one word per FMICLK clock in burst mode. The maximum FMICLK frequency is
96MHz.
The baud rate clock is an internal clock derived from f
UART peripherals for baudrate generation. The frequency can be optionally divided by 2.
EXTCLK_T2T3
EXTCLK_TOT1
USB_CLK48M
MII_PHYCLK
X1_CPU
X1_RTC
X1_CPU
X2_RTC
Clock control
4-25MHz
48MHz
25MHz
MSTR
16-bit prescaler
16-bit prescaler
) can be divided to operate at a slower frequency reference clock (RCLK)
Main
OSC
RTC
OSC
f
OSC
32.768kHz
f
RTC
PHYSEL
PLL
TIM01CLK
TIM23CLK
f
PLL
Master CLK
1/2
1/2
MSTR
f
MSTR
(1,2,4,8,16,1024)
To USB
BRCLK
To UART
USBCLK
that is used by the three on-chip
RCLK
DIV
RCLK
1/2
Functional overview
AHB DIV
APB DIV)
(1,2,4)
(1,2,4,8)
CPUCLK
FMICLK
HCLK
PCLK
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