UPSD3422 datasheet(182/293 Pages) STMICROELECTRONICS

182 / 293 page

Programmable counter array (PCA) with PWM

uPSD34xx

182/293

Table 96.

PCA0 control register PCACON0 (SFR 0A4h, reset value 00h)

Table 97.

PCA1 control register PCACON1 (SFR 0BCh, reset value 00h)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

EN-ALL

EN_PCA

EOVFI

PCAIDLE

–

CLK_SEL[1:0]

Bit

Symbol

Function

7EN-ALL

0 = No impact on TCM modules

1 = Enable both PCA counters simultaneously (override the EN_PCA Bits)

This bit is to start the two 16-bit counters in the PCA. For customers who

want 5 PWM, for example, this bit can start all of the PWM outputs.

6EN_PCA

0 = PCA counter is disabled

1 = PCA counter is enabled

EN_PCA Counter Run Control Bit. Set with software to turn the PCA

counter on. Must be cleared with software to turn the PCA counter off.

EOVFI

1 = Enable Counter Overflow Interrupt if overflow flag (OVF) is set

4PCAIDLE

0 = PCA operates when CPU is in Idle Mode

1 = PCA stops running when CPU is in Idle Mode

3–

Reserved

210B_PWM

0 = Select 16-bit PWM

1 = Select 10-bit PWM

1-0

CLK_SEL

[1:0]

00 Select Prescaler clock as Counter clock

01 Select Timer 0 Overflow

10 Select External Clock pin (P4.3 for PCA0) (MAX clock rate = fOSC/4)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

–

EN_PCA

EOVFI

PCAIDLE

–

CLK_SEL[1:0]

Bit

Symbol

Function

6EN_PCA

0 = PCA counter is disabled

1 = PCA counter is enabled

EN_PCA Counter Run Control Bit. Set with software to turn the PCA

counter on. Must be cleared with software to turn the PCA counter off.

EOVFI

1 = Enable Counter Overflow Interrupt if overflow flag (OVF) is set

4PCAIDLE

0 = PCA operates when CPU is in Idle Mode

1 = PCA stops running when CPU is in Idle Mode

3–

Reserved

210B_PWM

0 = Select 16-bit PWM

1 = Select 10-bit PWM

1-0

CLK_SEL

[1:0]

00 Select Prescaler clock as Counter clock

01 Select Timer 0 Overflow

10 Select External Clock pin (P4.7 for PCA1) (MAX clock rate = fOSC/4)

UPSD3422 Datasheet(PDF) 182 Page - STMicroelectronics

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