UPSD3422 datasheet(175/293 Pages) STMICROELECTRONICS

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uPSD34xx

Programmable counter array (PCA) with PWM

175/293

Programmable counter array (PCA) with PWM

There are two Programmable Counter Array blocks (PCA0 and PCA1) in the uPSD34xx. A

PCA block consists of a 16-bit up-counter, which is shared by three TCM (Timer Counter

Module). A TCM can be programmed to perform one of the following four functions:

Capture Mode: capture counter values by external input signals

Timer Mode

Toggle Output Mode

PWM Mode: fixed frequency (8-bit or 16-bit), programmable frequency (8-bit only)

27.1

PCA block

The 16-bit Up-Counter in the PCA block is a free-running counter (except in PWM Mode

with programmable frequency). The Counter has a choice of clock input: from an external

pin, Timer 0 Overflow, or PCA Clock.

A PCA block has 3 Timer Counter Modules (TCM) which share the 16-bit Counter output.

The TCM can be configured to capture or compare counter value, generate a toggling

output, or PWM functions. Except for the PWM function, the other TCM functions can

generate an interrupt when an event occurs.

Every TCM is connected to a port pin in Port 4; the TCM pin can be configured as an event

input, a PWMs, a Toggle Output, or as External Clock Input. The pins are general I/O pins

when not assigned to the TCM.

The TCM operation is configured by Control registers and Capture/Compare registers.

Table 93 on page 176 lists the SFR registers in the PCA blocks.

Figure 58.

PCA0 block diagram

TIMER0

OVERFLOW

P4.3/ECI

PCACH0

8-bit

PCACL0

8-bit

CLKSEL1

IDLE MODE

(From CPU)

OVF0

INT

EOVFI

TCM0

TCM1

TCM2

PWM FREQ

COMPARE

P4.0/CEX0

P4.1/CEX1

P4.2/CEX2

16-bit up Timer/Counter

CLKSEL0

PCAIDLE

PCA0CLK

CLEAR COUNTER

EN_PCA

EN_ALL

AI07857

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