T48C862-R4 datasheet(30/107 Pages) ATMEL

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T48C862-R4 [Preliminary]

4551C–4BMCU–01/04

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 man-

agement 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 independent of the NSTOP bit. If the oscillator is stopped

or the 32-kHz oscillator is selected, power consumption is extremely low.

Table 8.

Power-down Modes

Peripheral Modules

Addressing Peripherals

Accessing the peripheral modules takes place via the I/O bus (see Figure 27 on page

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

mary 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 register. Accessing the auxiliary register is performed

with the same instruction preceded by writing the module address into the auxiliary

switching module. Byte wide registers are accessed by multiple IN- (or OUT-) instruc-

tions. For more complex peripheral modules, with a larger number of registers,

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

rectly 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-

Stop(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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