MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 548

• Manufacturer Part Number: MPC555CME
• Description: KIT EVALUATION FOR MPC555
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC555CME

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC555
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: MPC555
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

15.9 MIOS Counter Prescaler Submodule (MCPSM)
15.9.1 MIOS Counter Prescaler Submodule (MCPSM) Registers
MPC555
USER’S MANUAL
cording to this level, the ICS sets the correct IRQ[7:0] lines with the correct ILBS[1:0]
time multiplex lines on the peripheral bus. The CPU is then informed as to which of the
thirty-two interrupt levels is requested.
Based on the interrupt level requested, the software must determine which submodule
requested the interrupt. The software may use a find-first-one type of instruction to de-
termine, in the concerned MIRSM, which of the bits is set. The CPU can then serve
the requested interrupt.
The MIOS counter prescaler submodule (MCPSM) divides the MIOS1 clock (F
generate the counter clock. It is designed to provide all the submodules with the same
division of the main MIOS1 clock (division of F
The clock signal is prescaled by loading the value of the clock prescaler register into
the prescaler counter every time it overflows. This allows all prescaling factors be-
tween two and 16. Counting is enabled by asserting the PREN bit in the control regis-
ter. The counter can be stopped at any time by negating this bit, thereby stopping all
submodules using the output of the MCPSM (counter clock).
Table 15-9
/
MPC556
MCPSMSCR
is the address map for the MCPSM submodule.
Prescaler
Register
Clock
MODULAR INPUT/OUTPUT SUBSYSTEM (MIOS1)
Figure 15-3 MCPSM Block Diagram
PREN
CP0
CP1
CP2
CP3
Rev. 15 October 2000
f
Enable
SYS
Decrementer
4-bit
Dec.
SYS
Load
). It uses a 4-bit modulus counter.
= 1?
Counter Clock
MOTOROLA
SYS
15-12
) to