AT89LS52-16SC ATMEL [ATMEL Corporation], AT89LS52-16SC Datasheet - Page 20

• Manufacturer Part Number: AT89LS52-16SC
• Description: 8-bit Low-Voltage Microcontroller with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

16. Power-down Mode
20
AT89LS52
In the Power-down mode, the oscillator is stopped, and the instruction that invokes Power-down
is the last instruction executed. The on-chip RAM and Special Function Registers retain their
values until the Power-down mode is terminated. Exit from Power-down mode can be initiated
either by a hardware reset or by activation of an enabled external interrupt (INT0 or INT1). Reset
redefines the SFRs but does not change the on-chip RAM. The reset should not be activated
before V
the oscillator to restart and stabilize.
Figure 16-1. Oscillator Connections
Note:
Figure 16-2. External Clock Drive Configuration
CC
C1, C2 = 30 pF ± 10 pF for Crystals
is restored to its normal operating level and must be held active long enough to allow
= 40 pF ± 10 pF for Ceramic Resonators
OSCILLATOR
EXTERNAL
SIGNAL
NC
C2
C1
XTAL2
XTAL1
GND
XTAL2
XTAL1
GND
2601B–MICRO–03/05