Cypress FM4 Series - Page 89

CHAPTER 2-2: Clock Gating
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 89
Procedures of Gating and Resupplying Clocks
Figure 3-2 explains the procedures of gating the clocks of peripheral functions and resupplying clocks to
peripheral functions.
Figure 3-2 Procedures of Gating Clocks of Peripheral Functions and Resupplying Clocks to Peripheral Functions
Operation stop of peripheral functions
Gating setting of peripheral clocks
(CKEN*
1
register setting change)
Reset Control to peripheral function
where peripheral clocks are gated.
Reset enabled(MRST*
2
: 0b0 -> 0b1)
Reset released(MRST*
2
: 0b1 -> 0b0)
Peripheral function clock gating completed
Clock gating of
peripheral Function
Resupplying Clock to
peripheral function
Reset control of peripheral functions which
restart clock supply to peripheral functions.
Reset enabled(MRST*
2
: 0b0 -> 0b1)
Reset released(MRST*
2
: 0b1 -> 0b0)
Supply settings of Peripheral clocks
(CKEN*
1
registar setting change)
CKEN*
1
read value =Written value?
No
Yes
Operation restart of peripheral functions
(Access to target macros enabled)
*1: Indicates CKEN0, CKEN1, and CKEN2
*2: Indicates MRST0, MRST1, and MRST2