Cypress FM4 Series - BOOST Register

CHAPTER 7-3: VBAT Domain(B)
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 341
7.4 BOOST Register
BOOST Register sets the clock value of oscillation boost.
bit
7
6
5
4
3
2
1
0
Field
Reserved
BOOST1
BOOST0
Attribute
-
R/W
R/W
Initial value
-
1
1
The interface circuit type for this register is type 1.
[bit7:2] Reserved: Reserved bits
These bits read 0b000000.
In a write access to these bits, write 0b000000 to them.
[bit1:0] BOOST1, BOOST0: Oscillation boost time set bits
These bits set the number of clocks for oscillation boost.
Table 7-4 Settings of Oscillation Boost Time
BOOST1
BOOST0
Oscillation boost time
1
1
500 ms [Initial value]
1
0
250 ms
0
1
125 ms
0
0
62.5 ms