M32C83T datasheet(167/527 Pages) RENESAS

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Page 144

14. Timer (Timer A)

)

(

Table 14.5 Specifications in Event Counter Mode (when processing two-phase pulse signal on

timer A2, A3 and A4)

Item

Specification

Count Source

Two-phase pulse signal applied to the TAiIN pin, or TAiIN and TAiOUT pin (i = 2 to 4)

Counting Operation

• Two-phase pulse signal determines whether the timer increments or decrements a

counter value

• When the timer counter overflows or underflows, content of the reload register is

reloaded into the count register and counting resumes. With the free-running count

function, the timer counter continues running without reloading.

Divide Ratio

• 1/ (FFFF16 - n + 1) for counter increment

• 1/ (n + 1) for counter decrement

n : setting value of the TAi register

000016 to FFFF16

Counter Start Condition

The TAiS bit in the TABSR register is set to "1" (starts counting)

Counter Stop Condition

The TAiS bit is set to "0" (stops counting)

Interrupt Request Generation Timing The timer counter overflows or underflows

TAiIN Pin Function

Two-phase pulse signal is applied

TAiOUT Pin Function

Two-phase pulse signal is applied

Read from Timer

The TAi register indicates counter value

Write to Timer

• When the timer counter stops,

the value written to the TAi register is also written to both reload register and counter

• While counting,

the value written to the TAi register is written to the reload register

(It is transferred to the counter at the next reload timing)

Selectable Function(1)

• Normal processing operation (the timer A2 and timer A3)

While a high-level ("H") signal is applied to the TAjOUT pin (j = 2 or 3), the timer incre-

ments a counter value on the rising edge of the TAjIN pin or decrements a counter

value on the falling edge.

TAjOUT

Increment

Decrement

TAjIN

Increment Increment

Decrement Decrement

TAkOUT

TAkIN

Increment on all edges

Decrement on all edges

NOTES:

1. Only timer A3 operation can be selected. The timer A2 is for the normal processing operation. The

timer A4 is for the multiply-by-4 operation.

• Multiply-by-4 processing operation (the timer A3 and timer A4)

While an "H" signal is applied to the TAkOUT pin (k = 3 or 4) with the rising edge of the

TAkIN pin, the timer counter increments a counter value on the rising and falling edges of

the TAkOUT and TAkIN pins.

While "H" is applied to the TAkOUT pin on the falling edge of the TAkIN pin, the timer

decrements a counter value on the rising and falling edges of the TAkOUT and TAkIN pins.

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