Freescale Semiconductor Demonstration Board for Freescale MC9S12XHY256 Microcontroller DEMO9S12XHY256 DEMO9S12XHY256 Manual De Usuario
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DEMO9S12XHY256
Voltage Regulator (S12VREGL3V3V1)
MC9S12XHY-Family Reference Manual, Rev. 1.04
304
Freescale Semiconductor
9.3.2.4
Autonomous Periodical Interrupt Trimming Register (VREGAPITR)
The VREGAPITR register allows to trim the API timeout period.
0x02F3
7
6
5
4
3
2
1
0
R
APITR5
APITR4
APITR3
APITR2
APITR1
APITR0
0
0
W
Reset
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1. Reset value is either 0 or preset by factory. See Section 1 (Device Overview) for details.
= Unimplemented or Reserved
Figure 9-4. Autonomous Periodical Interrupt Trimming Register (VREGAPITR)
Table 9-7. VREGAPITR Field Descriptions
Field
Description
7–2
APITR[5:0]
Autonomous Periodical Interrupt Period Trimming Bits — See
for trimming effects.
Table 9-8. 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]