Cypress FM4 Series - CCS;CCB Register

CHAPTER 7-3: VBAT Domain(B)
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 339
7.3 CCS/CCB Register
CCS Register sets the current value when the oscillation sustains.
CCB Register sets the boost current at the oscillation start.
TYPE3-M4 products
■CCS Register
bit
7
6
5
4
3
2
1
0
Field
CCS
Attribute
R/W
Initial value
00001000
The interface circuit type for this register is type 3.
[bit7:0] CCS: Oscillation sustain current set bits
These bits set the value of current for sustaining oscillation.
■CCB Register
bit
7
6
5
4
3
2
1
0
Field
CCB
Attribute
R/W
Initial value
00010000
The interface circuit type for this register is type 1.
[bit7:0] CCB: Oscillation boost current set bits
These bits set the value of boost current at the start of oscillation.
Table 7-2 shows the relationship between the settings of the CCS/CCB Register and the current values.
Table 7-2 Relationship between Settings of CCS/CCB Register and Current Values
CCS/CCB
Current value (Type)
Remark
00000000
(0 nA)
Setting the CCS/CCB Register to this value is prohibited if the 32 kHz
oscillation is enabled.
00000001
Undefined
Setting prohibited
0000001x
Undefined
Setting prohibited
000001xx
385 nA
00001xxx
445 nA
(Initial value of CCS Register)
0001xxxx
510 nA
(Initial value of CCB Register)
Undefined
Setting prohibited
01xxxxxx
Undefined
Setting prohibited
1xxxxxxx
Undefined
Setting prohibited