ATAM862 datasheet(32/110 Pages) ATMEL

32 / 110 page

4554E–4BMCU–05/06

ATAM862-3

The microcontroller block has various power-down modes. During the sleep mode the clock for

the microcontroller block core is stopped. With the NSTOP bit in the clock management register

(CM), it is programmable if the clock for the on-chip peripherals is active or stopped during the

sleep mode. If the clock for the core and the peripherals is stopped, the selected oscillator is

switched off. An exception is the 32-kHz oscillator, if it is selected it runs continuously indepen-

dent of the NSTOP bit. If the oscillator is stopped or the 32-kHz oscillator is selected, power

consumption is extremely low.

Table 20-1.

Power-down Modes

21. Peripheral Modules

21.1

Addressing Peripherals

Accessing the peripheral modules takes place via the I/O bus (see Figure 21-1 on page

33). The IN or OUT instructions allow direct addressing of up to 16 I/O modules. A dual register

addressing scheme has been adopted to enable direct addressing of the primary register. To

address the auxiliary register, the access must be switched with an auxiliary switching module.

Thus, a single IN (or OUT) to the module address will read (or write into) the module primary

writing the module address into the auxiliary switching module. Byte wide registers are accessed

by multiple IN- (or OUT-) instructions. For more complex peripheral modules, with a larger num-

ber of registers, extended addressing is used. In this case, a bank of up to 16 subport registers

are indirectly addressed with the subport address. The first OUT instruction writes the subport

address to the sub address register, the second IN or OUT instruction reads data from or writes

data to the addressed subport.

Mode

CPU

Core

Osc-Sto

p(1)

Brown-out

Function

RC-oscillator 1

RC-oscillator 2

4-MHz Oscillator

32-kHz

Oscillator

External

Input Clock

Active

RUN

Active

RUN

YES

Power-down

SLEEP

Active

RUN

YES

SLEEP

YES

STOP

RUN

STOP

Note:

Osc-Stop = SLEEP and NSTOP and WDL

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