ST7PMC2N6B6(2004) 查看數據表（PDF） - STMicroelectronics

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ST7PMC2N6B6
(Rev.:2004)

8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, BRUSHLESS MOTOR CONTROL, FIVE TIMERS, SPI, LINSCI™

STMicroelectronics 

ST7MC1/ST7MC2

MOTOR CONTROLLER (Cont’d)

Bits 2:0 = VR[2:0]: BEMF/demagnetisation Refer-

ence threshold

These bits select the Vref value as shown in the

Table 65. The Vref value is used for BEMF and

Demagnetisation detection.

Table 65. Threshold voltage setting

VR2 VR1 VR0 Vref voltage threshold

1

1

1

Threshold voltage set by

external MCVREF pin

1

1

0

3.5V*

1

0

1

2.5V*

1

0

0

2V*

0

1

1

1.5V*

0

1

0

1V*

0

0

1

0.6V*

0

0

0

0.2V*

*Typical values for VDD=5V

PHASE STATE REGISTER (MPHST)

Read/Write

Reset Value: 0000 0000 (00h)

7

6

5

4

3

2

1

0

IS1* IS0* OO5* OO4* OO3* OO2* OO1* OO0*

Bit 7:6 = IS[1:0]*: Input Selection bits

These bits mainly select the input to connect to

comparator as shown in Table 66. The fourth con-

figuration (IS[1:0] = 11) specifies that an incremen-

tal encoder is used (in that case MCIA and MCIB

digital signals are directly connected to the incre-

mental encoder interface and the analog multi-

plexer is bypassed.

Table 66. Input Channel Selection

IS1 IS0

Channel selected

0

0

MCIA

0

1

MCIB

1

0

MCIC

1

1 Both MCIA and MCIB: Encoder Mode

Bits 5:0 =OO[5:0]*: Channel On/Off bits

These bits are used to switch channels on/off at

the next C event if the DAC bit =0 or directly if

DAC=1

0: Channel Off, the relevant switch is OFF, no

PWM possible

1: Channel On the relevant switch is ON, PWM is

possible (not signifiant when PCN bit is set).

Table 67. OO[5:0] Bit Meaning

OO[5:0]

0

1

Output Channel State

Inactive

Active

* Preload bits, new value taken into account at

next C event.

Caution: As the MPHST register contains bits with

preload, the whole register has to be written at

once. This means that a Bit Set or Bit Reset in-

struction on only one bit without preload will have

the effect of resetting all the bits with preload.

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