Cypress FM4 Series - Page 335

CHAPTER 7-3: VBAT Domain(B)
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 335
 When using the VBAT I/O as a peripheral function:
・Setting procedure example
The following is a setting example of using P48 and P49 as peripheral function.
(1) Initiate the VBAT domain (see Figure 2-6).
(2) Set the general-purpose IO port to use it as the peripheral function.
(3) Set the pull-up.
(4) Set the port pseudo open drain.
(5) Transfer the setting value to the VBAT domain.
(6) Wait until the transfer is completed.
(1) Initialized VBAT Domain
(3) Write "11" to VBPFR[1:0]
(4) Write "Data" to VBPCR[1:0]
(5) Write "Data" to VBPZR[1:0]
(6) Write "1" to WTCR20[5]
END
(2) WTCR10[7] == 0
Yes
No
(7) WTCR10[7] == 0
Yes
No