CHAPTER 2-2: Clock Gating
104 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
[bit11:9] Reserved: Reserved bits
Write 0 to these bits.
[bit8] SDCCK: Settings for operation clock supply and gating to SD card interface
This bit controls the operation clock supply and gating to the SD card interface function. When this bit is
set to 1, the bus clock is supplied to the SD card interface unit to use the SD card interface function. For
products to which the relevant SD card interface unit is not mounted, do not change the relevant bit from
the initial value.
When this bit is set to 0, the bus clock input to the SD card interface unit is gated. While the bus clock
input is gated, the functions of the SD card interface cannot be used.
Gates the bus clock input to SD card interface. (Initial value)
Supplies the bus clock to SD card interface.
[bit7] Reserved: Reserved bits
Write 0 to these bits.
[bit6:4] CANCK[2:0]: Settings for clock supply and gating to CAN controller
These bits control bus clock (base clock) supply and gating to the CAN controller. The correspondence
between each bit and the CAN controller channel is shown below.
bit4 - CANCK0: CAN controller channel 0
bit5 - CANCK1: CAN controller channel 1
bit6 - CANCK2: CAN controller channel 2 (For TYPE3-M4 and TYPE4-M4 products, CAN-FD)
When the relevant bit is set to 1, the bus clock is supplied to the corresponding CAN controller channel to
use the CAN controller function. For products to which the relevant CAN controller channel is not mounted,
do not change the relevant bit from the initial value.
When the relevant bit is set to 0, the bus clock input to the corresponding CAN controller channel is gated.
While the bus clock input is gated, the CAN controller function of the corresponding channel cannot be used.
Gates the bus clock input to the CAN controller channel corresponding to the relevant bit. (Initial
value: For products not mounting CAN controller)
Supplies the bus clock input to the CAN controller channel corresponding to the relevant bit. (Initial
value: For products mounting CAN controller)
[bit3:2] Reserved: Reserved bits
Write 0 to these bits.
[bit1:0] USBCK[1:0]: Settings for operation clock supply and gating of USB(function/host)
These bits control the operation clock supply and gating to USB (function/host). The correspondence
between each bit and the USB channel is shown below.
bit0 - USBCK0: USB channel 0
bit1 - USBCK1: USB channel 1
When the relevant bit is set to 1, the bus clock is supplied to the corresponding USB channel to use the
USB function. For products to which the relevant USB channel is not mounted, it is prohibited to change
the relevant bit from the initial value.
When the relevant bit is set to 0, the bus clock input to the corresponding USB channel is gated. While
the bus clock input is gated, the USB function of the corresponding channel cannot be used.
Gates the bus clock input to the USB channel corresponding to the relevant bit. (Initial value)
Supplies the bus clock to the USB channel corresponding to the relevant bit.
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