AT91M40400(1998) データシートの表示（PDF） - Atmel Corporation

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AT91M40400
(Rev.:1998)

16/32-Bit Microcontroller

Atmel Corporation 

AT91M40400

TC: Timer Counter

The AT91M40400 features a Timer Counter block which

includes three identical 16-bit timer counter channels. Each

channel can be independently programmed to perform a

wide range of functions including frequency measurement,

event counting, interval measurement, pulse generation,

delay timing and pulse width modulation.

Each Timer Counter channel has 3 external clock inputs, 5

internal clock inputs, and 2 multi-purpose input/output sig-

nals which can be configured by the user. Each channel

drives an internal interrupt signal which can be pro-

grammed to generate processor interrupts via the AIC

(Advanced Interrupt Controller).

The Timer Counter block has two global registers which act

upon all three TC channels. The Block Control Register

allows the three channels to be started simultaneously with

the same instruction. The Block Mode Register defines the

external clock inputs for each Timer Counter channel,

allowing them to be chained.

WD: Watchdog Timer

The AT91 series microcontrollers have an internal watch-

dog timer which can be used to prevent system lock-up if

the software becomes trapped in a deadlock.

PS: Power Saving

The AT91M40400 Power Saving module provides a low-

power Idle Mode. In Idle Mode, the CPU clock is deacti-

vated while all on-chip peripherals and the RAM remain

active. The contents of the on-chip RAM and all the special

function registers remain unchanged during this mode. The

Idle Mode can be terminated by any enabled interrupt or by

a hardware Reset.

SF: Special Function

The AT91M40400 provides registers which implement the

following special functions.

• Chip identification

• RESET status

7

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