Cypress FM4 Series - Pull-Up Set Register (VBPCR)

CHAPTER 7-3: VBAT Domain(B)
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 347
7.9 Pull-up Set Register (VBPCR)
VBPCR Register sets the pull-up of pins.
In TYPE4-M4 products, there is no pull-up function of P46/X0A pin and P47/X1A pin, therefore the
settings of the VBPCR[3:2] are invalid.
bit
7
6
5
4
3
2
1
0
Field
Reserved
VPCR3
VPCR2
VPCR1
VPCR0
Attribute
-
R/W
R/W
R/W
R/W
Initial value
-
0
0
0
0
The interface circuit type for this register is type 3.
[bit7:4] Reserved: Reserved bits
These bits read 0b0000.
In a write access to these bits, write 0b0000 to them.
[bit3] VPCR3: P46/X0A pin pull-up set bit
[bit2] VPCR2: P47/X1A pin pull-up set bit
[bit1] VPCR1: P49/VWAKEUP pin pull-up set bit
[bit0] VPCR0: P48/VREGCTL pin pull-up set bit
bit
Description
Reading
A read access reads the value of this bit. (Initial value = 0)
Writing
0
The pull-up resistor of the pin corresponding to the VPCR3/VPCR2/VPCR1/VPCR0 bit is
disconnected from the pin.
1
If the pin corresponding to the VPCR3/VPCR2/VPCR1/VPCR0 bit is in the input state (either
GPIO function or peripheral function), the pull-up resistor is connected to the pin.
If the pin corresponding to the VPCR3/VPCR2/VPCR1/VPCR0 bit is in the output state, the
pull-up resistor is disconnected from the pin.