QADC64E Enhanced Mode Operation
MPC561/MPC563 Reference Manual, Rev. 1.2
14-8
Freescale Semiconductor
14.3.1
QADC64E Module Configuration Register
The QADCMCR contains fields and bits that control freeze and stop modes, operating mode of the
QADC64E module, determine the privilege level required to access most registers and master/slave
operation.
.
14.3.1.1
Low Power Stop Mode
When the STOP bit in the QADCMCR is set, the QADC64E clock (QCLK) which clocks the A/D
converter, is disabled and the analog circuitry is powered down. This results in a static, low power
consumption, idle condition. The stop mode aborts any conversion sequence in progress. Because the bias
currents to the analog circuits are turned off in stop mode, the QADC64E requires some recovery time (T
SR
in Appendix F: Electricl Characteristics) to stabilize the analog circuits after the stop enable bit is cleared.
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LSB
15
Field STOP FRZ
—
LOCK FLIP SUPV
—
SRESET
0000_0000
1
000_0000
Addr
0x30 4800 (QADCMCR_A); 0x30 4C00 (QADCMCR_B)
Figure 14-4. Module Configuration Register (QADCMCR)
Table 14-5. QADCMCR Bit Descriptions
Bits
Name
Description
0
STOP
Section 14.3.1.1, “Low Power Stop Mode
” for more information.
0 Disable stop mode
1 Enable stop mode
1
FRZ
Section 14.3.1.2, “Freeze Mode
” for more information.
0 Ignores the IMB3 internal FREEZE signal
1 Finish any conversion in progress, then freeze
2:5
—
Reserved
6
LOCK
Lock/Unlock QADC Mode of operation as defined by FLIP bit. Refer to
“Switching Between Legacy and Enhanced Modes of Operation
” for more information.
0 QADC mode is locked
1 QADC mode is unlocked and changeable using FLIP bit
7
FLIP
QADC Mode of Operation. The FLIP bit allows selection of the mode of operation of the QADC
module, either Legacy Mode (default) or Enhanced Mode. This bit can only be written when the
LOCK is set (unlocked). Refer to
Section 14.3.1.3, “Switching Between Legacy and Enhanced
” for more information.
0 Legacy Mode enabled
1 Enhanced Mode enabled
8
SUPV
Supervisor/Unrestricted Data Space. Refer to
Section 14.3.1.4, “Supervisor/Unrestricted
” and
for more information.
0 Only the module configuration register, test register, and interrupt register are designated as
supervisor-only data space. Access to all other locations is unrestricted.
1 All QADC64E registers and CCW/result tables are designated as supervisor-only data space.
9:15
—
Reserved.
Summary of Contents for MPC561
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