HD6433713 datasheet(163/324 Pages) RENESAS

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Timer load register C (TLC)

TLC is an 8-bit write-only register for setting the reload value of TCC. When a reload value is set

in TLC, the same value is loaded into timer counter C (TCC) as well, and TCC starts counting up

or down from that value. When TCC overflows or underflows during operation in auto-reload

mode, the TLC value is loaded in TCC. Accordingly, overflow and underflow periods can be set

within the range of 1 to 256 input clocks.

The same address is allocated to TLC as to TCC.

Upon reset, TLC is initialized to H'00.

8.4.3 Timer Operation

Timer C is an 8-bit multifunction timer. It can be used as an interval timer, an auto-reload timer,

or an event counter. (Event counting requires an input pin setting.)

Timer C operation modes

Timer C is an 8-bit up-/down-counter which is incremented or decremented each time a clock

pulse is input. The two operation modes, interval and auto-reload, are explained below.

•

Interval timer operation

When bit TMC7 in timer mode register C (TMC) is cleared to 0, timer C functions as an

8-bit interval timer.

Upon reset, timer counter C (TCC) is initialized to H'00 and TMC to H'18, so up-counting

and interval timing resume immediately after the reset. The clock input to timer C is selected

from seven internal clock signals output by prescaler S, or an external clock input at pin

P11/IRQ1. The selection is made by bits TMC2 to TMC0 in TMC.

Either software or hardware can control whether TCC counts up or down. The selection is

made by TMC bits TMC6 and TMC5.

Bit

Initial value

Read/Write

TLC7

TLC6

TLC5

TLC4

TLC3

TLC0

TLC2

TLC1

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HD6433713 Datasheet(PDF) 163 Page - Renesas Technology Corp