UPSD3422_06 Datasheet, PDF (175/293 Pages) STMicroelectronics – Turbo Plus Series Fast Turbo 8032 MCU with USB and Programmable Logic

uPSD34xx
Programmable counter array (PCA) with PWM
27 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:
1. Capture Mode: capture counter values by external input signals
2. Timer Mode
3. Toggle Output Mode
4. 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
PCA0CLK
TIMER0
OVERFLOW
P4.3/ECI
CLKSEL1 CLKSEL0
16-bit up Timer/Counter
PCACH0 PCACL0
8-bit
8-bit
OVF0
EOVFI
TCM0
INT
P4.0/CEX0
EN_ALL
EN_PCA
PCAIDLE
IDLE MODE
(From CPU)
CLEAR COUNTER
TCM1
TCM2
PWM FREQ
COMPARE
P4.1/CEX1
P4.2/CEX2
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