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UPSD3312D Datasheet(PDF) 153 Page - STMicroelectronics |
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UPSD3312D Datasheet(HTML) 153 Page - STMicroelectronics |
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153 / 272 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) UPSD33xx Programmable counter array (PCA) with PWM Doc ID 9685 Rev 7 153/272 26 Programmable counter array (PCA) with PWM There are two programmable counter array blocks (PCA0 and PCA1) in the UPSD33xx. 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) 26.1 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 98 on page 154 lists the SFR registers in the PCA blocks. Figure 46. 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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