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T48C862-R8 Datasheet

  • T48C862-R8

  • MCU

  • Atmel   Atmel

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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 4.
Power-down Modes
Brown-
out
Function
Active
Active
STOP
RC-oscillator 1
RC-oscillator 2
4-MHz
Oscillator
RUN
RUN
STOP
External
Input
Clock
YES
YES
STOP
Mode
Active
Power-
down
SLEEP
Note:
1.
CPU
Core
RUN
SLEEP
SLEEP
Osc-
Stop
(1)
NO
NO
YES
32-kHz
Oscillator
RUN
RUN
RUN
Osc-Stop = SLEEP and NSTOP and WDL
Peripheral Modules
Addressing Peripherals
Accessing the peripheral modules takes place via the I/O bus (see Figure 21). 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 regis-
ter. 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-) instructions. For
more complex peripheral modules, with a larger number of registers, extended address-
ing 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.
30
T48C862-R8
4590B鈥?BMCU鈥?2/03

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