17-44
MPC561/MPC563 Reference Manual
MOTOROLA
MIOS14 Double Action Submodule (MDASM)
17.9.6.4 MDASM Status/Control Register (MDASMSCRD) (Duplicated)
The MDASMSCRD and the MDASMSCR are the same registers accessed at two different
addresses.
Reading or writing to one of these two addresses has exactly the same effect.
WARNING
The user should not write directly to the address of the
MDASMSCRD. This register’s address may be reserved for
future use and should not be accessed by the software to ensure
future software compatibility.
The duplication of the SCR register allows coherent 32-bit accesses when using an RCPU.
17.9.6.5
MDASM Status/Control Register (MDASMSCR)
The status and control register gathers a read only bit reflecting the status of the MDASM
signal as well as read/write bits related to its control and configuration.
The signal input status bit reflects the status of the corresponding signal when in input
mode. When in output mode, the PIN bit only reflects the status of the output flip-flop.
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LSB
15
Field PIN WOR FREN
—
EDPOL FORCA FORCB
—
BSL
—
MODE
SRESET
—
000_0000_0000_0000
Addr
0x30 605E, 0x30 6066, 0x30 606E, 0x30 6076, 0x30 607E, 0x30 60DE, 0x30 60E6, 0x30 60EE,
0x30 60F6, 0x30 60FE
Figure 17-24. MDASM Status/Control Register (MDASMSCR)
Table 17-21. MDASMSCR Bit Descriptions
Bits
Name
Description
0
PIN
Pin Input Status — The pin input status bit reflects the status of the corresponding bit.
1
WOR
Wired-OR bit — In the DIS, IPWM, IPM and IC modes, the WOR bit is not used; reading this bit
returns the value that was previously written.
In the OCB, OCAB and OPWM modes, the WOR bit selects whether the output buffer is
configured for open-drain or totem pole operation. When open-drain mode is selected, the
EDPOL bit is not used; writing to EDPOL will have no effect on the output voltage.
1 Output buffer is open-drain.
0 Output buffer is totem pole.
The WOR bit is cleared by reset.
2
FREN
Freeze enable bit — This active high read/write control bit enables the MDASM to recognize the
MIOB freeze signal.
1 = The MDASM is frozen if the MIOB freeze line is active.
0 = The MDASM is not frozen even if the MIOB freeze line is active.
The FREN is cleared by reset.