System Configuration and Protection
MPC561/MPC563 Reference Manual, Rev. 1.2
6-44
Freescale Semiconductor
6.2.2.4.7
Real-Time Clock Alarm Register (RTCAL)
The RTCAL is a 32-bit read/write register. When the value of the RTC is equal to the value programmed
in the alarm register, a maskable interrupt is generated.
The alarm interrupt will be generated as soon as there is a match between the ALARM field and the
corresponding bits in the RTC. The resolution of the alarm is 1 second. This register is locked after reset
by default. Unlocking is accomplished by writing 0x55CC AA33 to its associated key register. See
Section 8.8.3.2, “Keep-Alive Power Registers Lock Mechanism
6.2.2.4.8
Periodic Interrupt Status and Control Register (PISCR)
The PISCR contains the interrupt request level and the interrupt status bit. It also contains the controls for
the 16-bits to be loaded into a modulus counter. This register can be read or written at any time.
MSB
0
LSB
31
Field
ALARM
Reset
Unaffected
Addr
0x2F C22C
Figure 6-37. Real-Time Clock Alarm Register (RTCAL)
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LSB
15
Field
PIRQ
PS
—
PIE
PITF
PTE
PORESET
0000_0000_0000_0000
Addr
0x2F C240
Figure 6-38. Periodic Interrupt Status and Control Register (PISCR)
Table 6-20. PISCR Bit Descriptions
Bits
Name
Description
0:7
PIRQ
Periodic interrupt request. These bits determine the interrupt priority level of the PIT. Refer to
Section 6.1.4, “Enhanced Interrupt Controller
” for interrupt level encoding.
8
PS
Periodic interrupt status. This bit is set if the PIT issues an interrupt. The PIT issues an interrupt
after the modulus counter counts to zero. PS can be negated by writing a one to it. A write of zero
has no affect.
9:12
—
Reserved
13
PIE
Periodic interrupt enable. If this bit is set, the time base generates an interrupt when the PS bit
is set.
14
PITF
PIT freeze. If this bit is set, the PIT stops while FREEZE is asserted.
15
PTE
Periodic timer enable
0 PIT stops counting and maintains current value
1 PIT continues to decrement
Summary of Contents for MPC561
Page 84: ...MPC561 MPC563 Reference Manual Rev 1 2 lxxxiv Freescale Semiconductor...
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...