QADC64E Legacy Mode Operation
MPC561/MPC563 Reference Manual, Rev. 1.2
13-8
Freescale Semiconductor
•
Status registers (QASR0 and QASR1) provide visibility on the status of each queue and the
particular conversion that is in progress (
Section 13.3.8, “Status Registers (QASR0 and QASR1)
”)
The CCW table follows the register block in the address map. There are 64 table entries to hold the desired
analog conversion sequences. Each CCW table entry is 16-bits, with ten implemented bits in four fields.
The final block of address space belongs to the result word table, which appears in three places in the
memory map. Each result word table location holds one 10-bit conversion value.
13.3.1
QADC64E Module Configuration Register (QADMCR)
The QADCMCR contains five implemented bits that control the operating modes of the QADC64E
module. The configurable modes are freeze, stop and supervisor. The QADCMCR also implements a pair
of bits that together select either legacy or enhanced mode for the QADC module, and lock that operating
mode.
.
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 13-4. Module Configuration Register (QADCMCR)
Table 13-5. QADCMCR Bit Descriptions
Bits
Name
Description
0
STOP
Section 13.3.1.1, “Low Power Stop Mode
,” for more information.
0 = Disable stop mode
1 = Enable stop mode
1
FRZ
Section 13.3.1.2, “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 13.3.1.3, “Switching Between Legacy and Enhanced
,” for more information.
0 = Legacy mode enabled
1 = Enhanced mode enabled
Summary of Contents for MPC561
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