MFC2000 datasheet(255/426 Pages) ETC

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Hardware Description

MFC 2000 Multifunctional Peripheral Controller 2000

100723A

Conexant

12-9

12.2.2 Scan Motor Current Control

The current control logic is added to this block. Two current control output signals (SMI[1:0]) are needed to control

4 different current modes. Three different current modes can be used within the time period of one step (See

Figure 12-5). T1 and T2 are programmable in one step period. The current mode in each current period of one

step period is programmable. CPU can load T1 and T2 values and current modes of three current periods within

one step for the next step at the same time when CPU loads the next step timer value by using the scan step

interrupt (SSTEPIRQ). In other words, T1, T2, and current modes are double buffered.

SMI[0] output value is 1 and SMI[1] output value is 1 after reset and when SM[3:0] pins are used as GPO’s. The

default current mode is also programmable when SM[3:0] pins are used as motor control pins and motor stepping

is disabled.

changing step pattern

(stepping to the next step)

one step period

different current

modes

different current

modes

different current

modes

Figure 12-5: Current Control Diagram

Two current control signals (SMI1 and SMI0) share same pins with PM[3]/GPO[3] and PM[2]/GPO[2]. There is a

SMI[1:0] output select bit in the SStepCtrl Register to select which signals output on PM[3:2] pins.

12.2.3 Register Description

Address:

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Default:

Scanner Motor

Pattern Register

(SMPattern)

01FF8057

(Not Used)

Rst. Value

xxh

Read Value

00h

Address:

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default:

Scanner Motor

Pattern Register

(SMPattern)

01FF8056

SMH[3]

SMH[2]

SMH[1]

SMH[0]

SMF[3]

SMF[2]

SMF[1]

SMF[0]

Rst. Value

00h

Read Value

00h

For the full step excitation, the phase pattern SM[3:0] (See Table 12-4 and Table 12-5) needs to be put into

SMF[3:0] of this SMPattern register. Bit[7:4] of this register are ‘don’t care’.

For the half step excitation, two adjacent phase patterns (See Table 12-6) need to be put into the SMPattern

SMH[7:4]. The current output at PM[3:0] is SMF[3:0].

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