Register Descriptions

7

6

0

Field SUPV

Reset

R/W:

R/W

Address

1000_0000

R

IPSBAR + 0x19_0000, 0x19_0001

Figure 27-3. QADC Module Configuration Register (QADCMCR)

Table 27-3. QADCMCR Field Descriptions

Bit(s)

Name

 

Description

 

 

 

15

QSTOP

Stop enable.

 

 

1

Force QADC to idle state.

 

 

0

QADC operates normally.

 

 

 

14

QDBG

Debug enable.

 

 

1

Finish any conversion in progress, then freeze in debug mode

 

 

0

QADC operates normally.

 

 

 

13–8

Reserved, should be cleared.

 

 

 

7

SUPV

Supervisor/unrestricted data space.

 

 

1

All QADC registers are accessible in supervisor mode only; user mode accesses have no

 

 

 

effect and result in a cycle termination error.

 

 

0

Only QADCMCR and QADCTEST require supervisor mode access; access to all other

 

 

 

QADC registers is unrestricted

 

 

 

6–0

Reserved, should be cleared.

 

 

 

 

27.6.2 QADC Test Register (QADCTEST)

The QADCTEST is a reserved register. Attempts to access this register outside of factory test mode will result in access privilege violation.

27.6.3 Port Data Registers (PORTQA and PORTQB)

QADC ports QA and QB are accessed through the 8-bit PORTQA and PORTQB.

Port QA signals are referred to as PQA[4:3, 1:0] when used as a bidirectional, 4-bit, input/output port. Port QA can also be used for analog inputs (AN[56:55, 53:52]), external trigger inputs (ETRIG[2:1]), and external multiplexer address outputs (MA[1:0]).

Port QB signals are referred to as PQB[3:0] when used as a 4-bit, digital input-only port. Port QB can also be used for non-multiplexed (AN[3:0]) and multiplexed (ANZ, ANY, ANX, ANW) analog inputs.

PORTQA and PORTQB are not initialized by reset.

MOTOROLA

Chapter 27. Queued Analog-to-Digital Converter (QADC)

27-9

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Motorola MCF5281, MCF5282 user manual Qadc Test Register Qadctest, Port Data Registers Portqa and Portqb