ST7MC1 datasheet(218/308 Pages) STMICROELECTRONICS

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ST7MC1/ST7MC2

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MOTOR CONTROLLER (Cont’d)

REPETITION COUNTER REGISTER (MREP)

Read/Write

Reset Value: 0000 0000 (00h)

Bits 7:0 = REP[7:0] Repetition counter value (N).

This register allows the user to set-up the update

rate of the PWM counter compare register (i.e. pe-

riodic transfers from preload to active registers),

as well as the PWM Update interrupt generation

rate, if these interrupts are enabled.

Each time the MREP related Down-Counter

reaches zero, the Compare registers are updated,

a U interrupt is generated and it re-starts counting

from the MREP value.

After a microcontroller reset, setting the CKE bit in

the MCRA register (i.e. enabling the clock for the

MTC peripheral) forces the transfer from the

MREP preload register to its active register and

generates a U interrupt. During run-time (while

CKE bit = 1) a new value entered in the MREP

preload register is taken into account after a U

event.

As shown in Figure 122, (N+1) value corresponds

to:

– The number of PWM periods in edge-aligned

mode

– The number of half PWM periods in center-

aligned mode.

–

COMPARE PHASE W PRELOAD REGISTER

HIGH (MCPWH)

Read/Write

Reset Value: 0000 0000 (00h)

Bits 7:0 = CPWH[7:0] Most Significant Byte of

phase W preload value

COMPARE PHASE W PRELOAD REGISTER

LOW (MCPWL)

Read/Write (except bits 2:0)

Reset Value: 0000 0000 (00h)

Bits 7:5 = CPWL[7:3] Low bits of phase W preload

value.

Bits 2:0 = Reserved.

COMPARE PHASE V PRELOAD REGISTER

HIGH (MCPVH)

Read/Write

Reset Value: 0000 0000 (00h)

Bit 7:0 = CPVH[7:0] Most Significant Byte of

phase V preload value

COMPARE PHASE V PRELOAD REGISTER

LOW (MCPVL)

Read/Write (except bits 2:0)

Reset Value: 0000 0000 (00h)

Bits 7:5 = CPVL[7:3] Low bits of phase V preload

value.

Bits 2:0 = Reserved.

REP7

REP6

REP5

REP4

REP3

REP2

REP1

REP0

CPWH

CPWL

---

CPVH7 CPVH6 CPVH5 CPVH4 CPVH3 CPVH2 CPVH1 CPVH0

CPVL7 CPVL6 CPVL5 CPVL4 CPVL3

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