Modular Input/Output Subsystem (MIOS14)
MPC561/MPC563 Reference Manual, Rev. 1.2
17-18
Freescale Semiconductor
17.7.3.2
MCPSM Status/Control Register (MCPSMSCR)
NOTE
If the binary value 0b0001 is entered in PSL[3:0], the output signal is stuck
at zero, no clock is output.
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LSB
15
Field PREN FREN
—
PSL3:0
SRESET
0000_0000_0000_0000
Addr
0x30 6816
Figure 17-9. MCPSM Status/Control Register (MCPSMSCR)
Table 17-7. MCPSMSCR Bit Descriptions
Bits
Name
Description
0
PREN
Prescaler enable bit — This active high read/write control bit enables the MCPSM counter. The
PREN bit is cleared by reset.
0 MCPSM counter disabled.
1 MCPSM counter enabled.
1
FREN
Freeze bit — This active high read/write control bit when set make possible a freeze of the
MCPSM counter if the MIOB freeze line is activated.
NOTE:
This line is active when
MIOS14MCR[STOP] is set or when MIOS14MCR[FREN] and the IMB3 FREEZE line are set.
When the MCPSM is frozen, it stops counting. Then when the FREN bit is reset or when the
freeze condition on the MIOB is negated, the counter restarts from where it was before freeze.
The FREN bit is cleared by reset.
0 MCPSM counter not frozen.
1 MCPSM counter frozen if MIOB freeze active.
2:11
—
Reserved
12:15
PSL[3:0] Clock prescaler — This 4-bit read/write data register stores the modulus value for loading into
the clock prescaler. The new value is loaded into the counter on the next time the counter equals
one or when disabled (PREN =0).
Table 17-8. Clock Prescaler Setting
PSL[3:0] Value
Divide Ratio
Hex
Binary
0x0
0b0000
16
0x1
0b0001
No counter clock output
0x2
0b0010
2
0x3
0b0011
3
...
...
...
0xE
0b1110
14
0xF
0b1111
15
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...