Modular Input/Output Subsystem (MIOS14)
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
17-17
•
Programmable 4-bit modulus down-counter
•
Wide range of possible division ratios: 2 through 16
•
Count inhibit under software control
17.7.1.1
MCPSM Signal Functions
The MCPSM has no associated external signals.
17.7.1.2
Modular I/O Bus (MIOB) Interface
•
The MCPSM is connected to all the signals in the read/write and control bus, to allow data transfer
from and to the MCPSM registers, and to control the MCPSM in the different possible situations.
•
The MIOS14 counter prescaler submodule does not use any 16-bit counter bus.
•
The MIOS14 counter prescaler submodule does not use the request bus.
17.7.2
Effect of RESET on MCPSM
When the RESET signal is asserted, all the bits in the MCPSM status and control register are cleared.
NOTE
The MCPSM is still disabled after the RESET signal is negated and
counting must be explicitly enabled by asserting MCPSMSCR[PREN].
17.7.3
MCPSM Registers
The privilege level to access to the MCPSM registers is supervisor only.
17.7.3.1
MCPSM Registers Organization
Table 17-6. MCPSM
Register Address Map
Address
Register
0x30 6810
Reserved
0x30 6812
Reserved
0x30 6814
Reserved
0x30 6816
MCPSM Status/Control Register (MCPSMSCR)
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...
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