Modular Input/Output Subsystem (MIOS14)
MPC561/MPC563 Reference Manual, Rev. 1.2
17-22
Freescale Semiconductor
17.8.4
Effect of RESET on MMCSM
When the RESET signal is asserted, only the FREN, EDGP, EDGN, and CLS bits in the MMCSMSCR are
cleared. The clock prescaler CP, PINC, and PINL bits in the same register are not cleared.
•
The PINC and PINL bits in the MMCSMSCR always reflect the state of the appropriate external
pins.
•
The MMCSM is disabled after reset and must be explicitly enabled by selecting a clock source
using the CLS bits.
The MMCSMCNT and the MMCSMML, together with the clock prescaler register bits, must be initialized
by software, because they are undefined after a hardware reset. A modulus value must be written to the
MMCSMCNT (which also writes into the MMCSMML) before the MMCSMSCR is written to. The latter
access initializes the clock prescaler.
17.8.5
MMCSM Registers
The privilege level to access to the MMCSM registers depends on the MIOS14MCR SUPV bit. The
privilege level is unrestricted after SRESET and can be changed to supervisor by software.
17.8.5.1
MMCSM Register Organization
Table 17-9. MMCSM Address Map
Address
Register
MMCSM6
0x30 6030
MMCSM6 Up-Counter Register (MMCSMCNT)
See
for bit descriptions.
0x30 6032
MMCSM6 Modulus Latch Register (MMCSMML)
See
for bit descriptions.
0x30 6034
MMCSM6 Status/Control Register Duplicated (MMCSMSCRD)
See
Section 17.8.5.5, “MMCSM Status/Control Register (MMCSMSCR)
” for bit descriptions.
0x30 6036
MMCSM6 Status/Control Register (MMCSMSCR).
See
for bit descriptions.
MMCSM7
0x30 6038
MMCSM7 Up-Counter Register (MMCSMCNT)
0x30 603A
MMCSM7 Modulus Latch Register (MMCSMML)
0x30 603C
MMCSM7 Status/Control Register Duplicated (MMCSMSCRD)
0x30 603E
MMCSM7 Status/Control Register (MMCSMSCR)
MMCSM8
0x30 6040
MMCSM8 Up-Counter Register (MMCSMCNT)
0x30 6042
MMCSM8 Modulus Latch Register (MMCSMML)
0x30 6044
MMCSM8 Status/Control Register Duplicated (MMCSMSCRD)
0x30 6046
MMCSM8 Status/Control Register (MMCSMSCR)
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...