Clocks and Power Control
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
8-27
illustrates the process of locking or unlocking a register powered by KAPWR.
Figure 8-13. Keep-Alive Register Key State Diagram
8.9
IRAMSTBY Supply Failure Detection
A special circuit for IRAMSTBY supply failure detection is provided. In the case of supply failure
detection, the dedicated sticky bits LVSRS in the VSRMCR register are asserted. Software can read or
clear these bits. The user should enable the detector and then clear these bits. If any of the LVSR bits are
read as one, then a power failure of IRAMSTBY has occurred. The circuit is capable of detecting supply
failure below a voltage level to be determined. Also, enable/disable control bit for the IRAMSTBY
detector may be used to disconnect the circuit and save the detector power consumption.
8.10
Power-Up/Down Sequencing
and
detail the power-up sequencing for MPC561/MPC563 during normal
operation. Note that for each of the conditions detailing the voltage relationships the absolute bounds of
the minimum and maximum voltage supply cannot be violated; that is, the value of VDDL cannot fall
below 2.5 V or exceed 2.7 V, and the value of VDDH cannot fall below 4.75 V or exceed 5.25 V for normal
operation. Power consumption during power up sequencing will be below the operating power
consumption.
0x2F C288
Reset Status Register (RSR)
See
for bit descriptions.
0x2F C388
Reset Status Register Key (RSRK)
SPR 22
Decrementer
See
Section 3.9.5, “Decrementer Register
” for bit descriptions.
0x2F C30C
Time Base and Decrementer Key (TBK)
SPR 268, 269,
284, 285,
Time Base
See
Section 6.2.2.4.2, “Time Base SPRs
,” for bit descriptions.
Table 8-8. KAPWR Registers and Key Registers (continued)
KAPWR Register
Associated Key Register
Address or
SPR Number
Register
Address
Register
Open
Locked
Write to the Key 0x55CCAA33
Write to the key other value
Power On Reset
(Valid for RTC, RTSEC,
RTCAL and RTCSC)
(Valid for other registers)
Power-On Reset
Summary of Contents for MPC561
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Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...