Datasheet

Chapter 23 Voltage Regulator (S12VREGL3V3V1)
MC9S12XE-Family Reference Manual Rev. 1.25
824 Freescale Semiconductor
0x02F4
76543210
R
APIR15 APIR14 APIR13 APIR12 APIR11 APIR10 APIR9 APIR8
W
Reset 0 0 0 00000
= Unimplemented or Reserved
Figure 23-6. Autonomous Periodical Interrupt Rate High Register (VREGAPIRH)
0x02F5
76543210
R
APIR7 APIR6 APIR5 APIR4 APIR3 APIR2 APIR1 APIR0
W
Reset 0 0 0 00000
Figure 23-7. Autonomous Periodical Interrupt Rate Low Register (VREGAPIRL)
Table 23-8. VREGAPIRH / VREGAPIRL Field Descriptions
Field Description
15-0
APIR[15:0]
Autonomous Periodical Interrupt Rate Bits — These bits define the timeout period of the API. See Table 23-
9 for details of the effect of the autonomous periodical interrupt rate bits. Writable only if APIFE = 0 of
VREGAPICL register.
Table 23-9. Selectable Autonomous Periodical Interrupt Periods
APICLK APIR[15:0] Selected Period
0 0000 0.2 ms
(1)
0 0001 0.4 ms
1
0 0002 0.6 ms
1
0 0003 0.8 ms
1
0 0004 1.0 ms
1
0 0005 1.2 ms
1
0 ..... .....
0 FFFD 13106.8 ms
1
0 FFFE 13107.0 ms
1
0 FFFF 13107.2 ms
1
1 0000 2 * bus clock period
1 0001 4 * bus clock period
1 0002 6 * bus clock period
1 0003 8 * bus clock period
1 0004 10 * bus clock period
1 0005 12 * bus clock period
1 ..... .....
1 FFFD 131068 * bus clock period
1 FFFE 131070 * bus clock period