UPSD3422_V01 datasheet(182/300 Pages) STMICROELECTRONICS

182 / 300 page

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Programmable counter array (PCA) with PWM

UPSD3422, UPSD3433, UPSD3434, UPSD3454

182/300

27.2

PCA clock selection

●

The clock input to the 16-bit up counter in the PCA block is user-programmable. The

three clock sources are:

●

PCA Prescaler Clock (PCA0CLK, PCA1CLK)

●

Timer 0 Overflow

●

External Clock, Pin P4.3 or P4.7

The clock source is selected in the configuration register PCACON. The Prescaler output

clock PCACLK is the fOSC divided by the divisor which is specified in the CCON2 or CCON3

fOSC/4.

Table 143.

PCA0 and PCA1 registers

SFR address

PCA0

PCA1

PCA0

PCA1

PCACL0

PCACL1

The low 8 bits of PCA 16-bit

counter.

PCACH0

PCACH1

The high 8 bits of PCA 16-bit

counter.

PCACON0

PCACON1

Control register

– Enable PCA, Timer Overflow

flag , PCA Idle Mode, and

Select clock source.

PCASTA

N/A

Status register, Interrupt Status

flags

– Common for both PCA Block 0

and 1.

A9,

AA,

BD,

BE,

TCMMODE0

TCMMODE1

TCMMODE2

TCMMODE3

TCMMODE4

TCMMODE5

TCM Mode

– Capture, Compare, and Toggle

Enable Interrupts

– PWM Mode Select.

CAPCOML0

CAPCOMH0

CAPCOML3

CAPCOMH3

Capture/Compare registers of

TCM0

CAPCOML1

CAPCOMH1

CAPCOML4

CAPCOMH4

Capture/Compare registers of

TCM1

CAPCOML2

CAPCOMH2

CAPCOML5

CAPCOMH5

Capture/Compare registers of

TCM2

PWMF0

PWMF1

The 8-bit register to program the

PWM frequency. This register is

used for programmable, 8-bit

PWM Mode only.

CCON2

CCON3

Specify the pre-scaler value of

PCA0 or PCA1 clock input

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