PSD511B1 datasheet(93/153 Pages) STMICROELECTRONICS

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PSD5XX Family

9.6.2.7 Load/Store

The Load operation transacts an Image Register (e.g. IMG0) write into its Counter/Timer

CNTR0) writes back into the Image Register (e.g. IMG0).

These signals are valid only when a Counter/timer is active. They are rising edge sensitive

and are used to Load a Counter with a required value or to Store the Counter value in the

associated Image Register.

In Waveform, Pulse and WatchDog modes the microcontroller writes into an Image

data transfer operation from an Image Register into its corresponding counter is called

LOAD. In Event Counting and Time Capture modes the Counter/Timer counts event pulses

or timer clock cycles, respectively. An external event or a software command can cause a

data transfer from the counting element into its Image Register. This operation is defined as

STORE.

These operations are triggered by:

t Software command

t Terminal count (in Waveform mode only)

t PPLD macrocell output

t Input Pin

Refer to Counter/Timer Command Register and Figure 43 for specific details.

9.6.2.8 Enable/Disable

These signals are used to enable or disable the counting of the Counter/Timers. These

signals are controlled by:

t Software command (Bits 2 and 7 of the Command Registers).

t PPLD macrocell output

t Input Pin

Event Count Mode:

In Event Count mode the Enable/Disable signal is edge sensitive and is connected to the

event input signal through the PPLD or pin. In Time Capture mode the Enable/Disable

signal can be set by a software command only.

Refer to Counter/Timer Command Register and Figure 43 for specific details.

9.6.2.9 Counter/Timer Input/Output

Each Counter can use individual control inputs in port E as input Load/Store or

Enable/Disable signals, and Counter/Timer outputs in port A or port B by selecting alternate

and special functions on the pins assigned to them. The outputs are used in waveform and

pulse modes in which the Counters generate output waveforms or pulses. The inputs can

be used in all modes of operation except WatchDog to create the LOAD/STORE and/or

ENABLE/DISABLE control signals. Port E can be configured as outputs for Terminal Count.

Terminal Count is also available as ZPLD inputs (via pin feedback). Refer to Tables 25, 26

and 27 for further details and configuration of these ports.

9.6.2.10 PPLD Macrocell

The enable/disable or load/store inputs of each Counter/Timer can be selected through a

PPLD macrocell, whose inputs are two product terms PTT0 and PTT1 from the PPLD’s

AND-array. The polarity of the PPLD macrocell output is programmable. The output of the

PPLD macrocell which is the enable/disable and/or Load/Store input to the Counter/Timer

can be in a Combinatorial mode or Register mode. Figure 44 shows the details of the PPLD

macrocell. Refer to the “ZPLD” section for further information on the PPLD.

Counter/Timer

(Cont.)

PSD511B1 Datasheet(PDF) 93 Page - STMicroelectronics

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