Datasheet

Chapter 14 Voltage Regulator (S12VREG3V3V5)
MC9S12XDP512 Data Sheet, Rev. 2.21
Freescale Semiconductor 561
14.3.2.4 Autonomous Periodical Interrupt Trimming Register (VREGAPITR)
The VREGAPITR register allows to trim the API timeout period.
76543210
R
APITR5 APITR4 APITR3 APITR2 APITR1 APITR0
00
W
Reset 0
1
0
1
0
1
0
1
0
1
0
1
00
1. Reset value is either 0 or preset by factory. See Device User Guide for details.
= Unimplemented or Reserved
Figure 14-5. Autonomous Periodical Interrupt Trimming Register (VREGAPITR)
Table 14-5. VREGAPITR Field Descriptions
Field Description
7–2
APITR[5:0]
Autonomous Periodical Interrupt Period Trimming Bits — See Table 14-6 for trimming effects.
Table 14-6. Trimming Effect of APIT
Bit Trimming Effect
APITR[5] Increases period
APITR[4] Decreases period less than APITR[5] increased it
APITR[3] Decreases period less than APITR[4]
APITR[2] Decreases period less than APITR[3]
APITR[1] Decreases period less than APITR[2]
APITR[0] Decreases period less than APITR[1]