MPC561MZP56 Freescale, MPC561MZP56 Datasheet - Page 260

• Manufacturer Part Number: MPC561MZP56
• Manufacturer: Freescale

Specifications of MPC561MZP56

• Cpu Family: MPC56x
• Device Core: PowerPC
• Device Core Size: 32b
• Frequency (max): 56MHz
• Interface Type: QSPI/SCI/SPI/UART
• Total Internal Ram Size: 32KB
• # I/os (max): 56
• Number Of Timers - General Purpose: 22
• Operating Supply Voltage (typ): 2.6/5V
• Operating Supply Voltage (max): 2.7/5.25V
• Operating Supply Voltage (min): 2.5/4.75V
• On-chip Adc: 2(32-chx10-bit)
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 388
• Package Type: BGA
• Program Memory Type: ROMLess
• Program Memory Size: Not Required
• Lead Free Status / RoHS Status: Not Compliant

System Configuration and Protection
is not affected by reset and operates in all low-power modes. It is initialized by software. The RTC can be
programmed to generate a maskable interrupt when the time value matches the value programmed in its
associated alarm register. It can also be programmed to generate an interrupt once a second. A control and
status register is used to enable or disable the different functions and to report the interrupt source.
6.1.9
The periodic interrupt timer consists of a 16-bit counter clocked by the PITRTCLK clock signal supplied
by the clock module as shown in
The 16-bit counter counts down to zero when loaded with a value from the PITC register. After the timer
reaches zero, the PS bit is set and an interrupt is generated if the PIE bit is a logic one. The software service
routine should read the PS bit and then write a zero to terminate the interrupt request. At the next input
clock edge, the value in the PITC is loaded into the counter, and the process starts over again.
When a new value is written into the PITC, the periodic timer is updated, the divider is reset, and the
counter begins counting. If the PS bit is not cleared, an interrupt request is generated. The request remains
pending until PS is cleared. If the PS bit is set again prior to being cleared, the interrupt remains pending
until PS is cleared.
Any write to the PITC stops the current countdown, and the count resumes with the new value in PITC. If
the PISCR[PTE] bit is not set, the PIT is unable to count and retains the old count value. Reads of the PIT
have no effect on the counter value.
6-20
PITRTCLK
Clock
Periodic Interrupt Timer (PIT)
PITRTCLK can be divided by 4 or 256. See
Disable
FREEZE
Clock
MPC561/MPC563 Reference Manual, Rev. 1.2
Figure
Figure 6-7. RTC Block Diagram
By 15625
By 78125
RTSEC
6-8.
Divide
Divide
4-MHz/20-MHz crystal
NOTE
MUX
Table 8-1
32-bit Register (RTCAL)
32-bit Counter (RTC)
for default settings.
=
Freescale Semiconductor
Interrupt
Interrupt
Alarm
Sec