MFC2000 datasheet(146/426 Pages) ETC

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MFC2000 Multifunctional Peripheral Controller 2000

Hardware Description

6-4

Conexant

100723A

6.4

Scan Control Timing

In this example, the scan motor has the constant speed. The scan motor stepping is synchronized to the MSINT.

The scan IRQ is used to disable motor stepping when we want to finish scanning. If the delay time for the scan

motor is long enough, the last step will occur after the scan IRQ. Then, we need to use the scan step IRQ

(sstepirq) for disabling motor stepping. The detail description for the motor stepping is described in Section 12.

- Load Delay timer register for scan motor

- Load Step Timer register for scan motor

- Set Stepping mode and dir for scan motor

- Load the initial step pattern

- Set scan motor mode for SM[3:0]

- Enable Step

- Enable Scan IRQ

- Set DMA for Line 1

- Scan Once (Line 1)

MSINT-0

Tics

Step

- Disable Step

- Set DMA for Line 3

- Scan Once (Line 3)

Dela

Time

Step

Time

Step

Time

- Enable Scan Video Signals

- Set GPO mode for SM[3:0]

Disable Scan IRQ

Scan IRQs

(Last MSINT)

Step

Scan Line 1

Scan Line 2

Shift Out Line 1

Step

- Set DMA for Line 2

- Scan Once (Line 2)

Step

Scan Line 3

Shift Out Line 2

Shift Out Line 3

Figure 6-3. Scan Control Timing

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