Chapter 17 Voltage Regulator (S12VREG3V3V5)
MC9S12XDP512 Data Sheet, Rev. 2.11
Freescale Semiconductor 741
17.3.2.4 Autonomous Periodical Interrupt Trimming Register (VREGAPITR)

The VREGAPITR register allows to trim the API timeout period.

Module Base + 0x_03
76543210
RAPITR5 APITR4 APITR3 APITR2 APITR1 APITR0 00
W
Reset 01010101010100
1. Reset value is either 0 or preset by factory. See Device User Guide for details.
= Unimplemented or Reserved

Figure 17-5. Autonomous Periodical Interrupt Trimming Register (VREGAPITR)

Table 17-5. VREGAPITR Field Descriptions

Field Description
7–2
APITR[5:0]
Autonomous Periodical Interrupt Period Trimming Bits — See Table 17-6 for trimming effects.

Table 17-6. 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]