HD6433635SW datasheet(176/418 Pages) RENESAS

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9.2

Timer A

9.2.1

Overview

Timer A is an 8-bit timer with interval timing and real-time clock time-base functions. The clock

time-base function is available when a 32.768-kHz crystal oscillator is connected. A clock signal

divided from 32.768 kHz or from the system clock can be output at the TMOW pin.

Features: Features of timer A are given below.

• Choice of eight internal clock sources (ø/8192, ø/4096, ø/2048, ø/512, ø/256, ø/128, ø/32, ø/8).

• Choice of four overflow periods (1 s, 0.5 s, 0.25 s, 31.25 ms) when timer A is used as a clock

time base (using a 32.768 kHz crystal oscillator).

• An interrupt is requested when the counter overflows.

• Any of eight clock signals can be output from pin TMOW: 32.768 kHz divided by 32, 16, 8, or

4 (1 kHz, 2 kHz, 4 kHz, 8 kHz), or the system clock divided by 32, 16, 8, or 4.

Block Diagram: Figure 9.1 shows a block diagram of timer A.

PSW

PSS

Legend:

TMOW

1/4

TMA

TCA

ø /32

ø /16

ø /8

ø /4

ø/32

ø/16

ø/8

ø/4

ø /128

ø/8192, ø/4096, ø/2048,

ø/512, ø/256, ø/128,

ø/32, ø/8

IRRTA

ø /4

TMA:

TCA:

IRRTA:

PSW:

PSS:

Note: Can be selected only when the prescaler W output (ø /128) is used as the TCA input clock.

Timer mode register A

Timer counter A

Timer A overflow interrupt request flag

Prescaler W

Prescaler S

Figure 9.1 Block Diagram of Timer A

HD6433635SW Datasheet(PDF) 176 Page - Renesas Technology Corp

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