ATAM893T-TKQ Atmel, ATAM893T-TKQ Datasheet - Page 21

• Manufacturer Part Number: ATAM893T-TKQ
• Description: IC MON TIRE-PRESS ATARX9X SER
• Manufacturer: Atmel
• Series: MARC4r

Specifications of ATAM893T-TKQ

• Core Processor: MARC4
• Core Size: 4-Bit
• Speed: 4MHz
• Connectivity: SSI (2-Wire, 3 Wire)
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: EEPROM
• Eeprom Size: 64 x 16
• Ram Size: 256 x 4
• Voltage - Supply (vcc/vdd): 1.8 V ~ 6.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 20-SOIC (5.3mm Width), 20-SO, 20-SOEIAJ
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -

4.6
4680C–4BMCU–01/05
Power-down Modes
Table 4-7.
Note:
The sleep mode is a shut-down condition which is used to reduce the average system power
consumption in applications where the microcontroller is not fully utilized. In this mode, the sys-
tem clock is stopped. The sleep mode is entered via the SLEEP instruction. This instruction sets
the interrupt enable bit (I) in the condition code register to enable all interrupts and stops the
core. During the sleep mode the peripheral modules remain active and are able to generate
interrupts. The microcontroller exits the sleep mode by carrying out any interrupt or a reset.
The sleep mode can only be kept when none of the interrupt pending or active register bits are
set. The application of the $AUTOSLEEP routine ensures the correct function of the sleep
mode. For standard applications use the $AUTOSLEEP routine to enter the power-down mode.
Using the SLEEP instruction instead of the $AUTOSLEEP following an I/O instruction requires
the insertion of 3 non I/O instruction cycles (for example NOP NOP NOP) between the IN or
OUT command and the SLEEP command.
The total power consumption is directly proportional to the active time of the microcontroller. For
a rough estimation of the expected average system current consumption, the following formula
should be used:
The ATAM893-D has various power-down modes. During the sleep mode the clock for the
MARC4 core is stopped. With the NSTOP bit in the clock management register (CM) it is pro-
grammable 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 4-8.
I
Note:
total
Power-down
Mode
SLEEP
Active
Mode
1
2
3
4
V
DD
If the bit CCS = 0 in the CM-register the RC-oscillator 1 always stops
,f
Osc-Stop = SLEEP and NSTOP and WDL
syscl
OS1
1
0
1
0
Oscillator Select
Power-down Modes
CPU Core
=
SLEEP
SLEEP
I
RUN
Sleep
OS0
1
1
0
0
+
I
DD
Stop
Osc-
YES
NO
NO
Input for SUBCL
t
------------- -
t
active
total
(1)
32 kHz
C
C
C
in
in
in
I
DD
Brown-out
/16
/16
/16
Function
Active
STOP
Active
depends on V
Selected Oscillators
RC-oscillator 1 and external input clock
RC-oscillator 1 and RC-oscillator 2
RC-oscillator 1 and 4-MHz crystal oscillator
RC-oscillator 1 and 32-kHz crystal oscillator
4-MHz Oscillator
RC-Oscillator 1
RC-Oscillator 2
DD
STOP
RUN
RUN
and f
syscl
Oscillator
32-kHz
ATAM893-D
RUN
RUN
RUN
Input Clock
External
STOP
YES
YES
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