Motorola MCF5281 ユーザーズマニュアル

MOTOROLA

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

27-17

If BQ2[6:0] is changed while queue 1 is active, the effect of BQ2[6:0] as an end-of-queue
indication for queue 1 is immediate. However, beware of the risk of losing the end-of-queue
1 when changing BQ2[6:0]. Using EOQ (channel 63) to end queue 1 is recommended.

If BQ2[6:0] was assigned to the CCW that queue 1 is currently
working on, then that conversion is completed before the
change to BQ2[6:0] takes effect.

Each time a CCW is read for queue 1, the CCW location is compared with the current value
of the BQ2[6:0] pointer to detect a possible end-of-queue condition. For example, if
BQ2[6:0] is changed to CCW3 while queue 1 is converting CCW2, queue 1 is terminated
after the conversion is completed. However, if BQ2[6:0] is changed to CCW1 while queue
1 is converting CCW2, the QADC would not recognize a BQ2[6:0] end-of-queue condition
until queue 1 execution reached CCW1 again, presumably on the next pass through the
queue.

Stop mode resets this register (0x007f)

15

14

13

12

11

10

9

8

Field

CIE2

PIE2

SSE2

MQ212

MQ211

MQ210

MQ29

MQ28

Reset

0000_0000

R/W:

R/W

7

6

5

4

3

2

1

0

Field RESUME

BQ26

BQ25

BQ24

BQ23

BQ22

BQ21

BQ20

Reset

0111_1111

R/W:

R/W

Address

IPSBAR + 0x19_000e, 0x19_000f