AT89S8253 Atmel Corporation, AT89S8253 Datasheet - Page 35
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AT89S8253
Manufacturer Part Number
AT89S8253
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT89S8253.pdf
(60 pages)
2.AT89S8253.pdf
(2 pages)
3.AT89S8253.pdf
(2 pages)
4.AT89S8253.pdf
(2 pages)
Specifications of AT89S8253
Flash (kbytes)
12 Kbytes
Max. Operating Frequency
24 MHz
Cpu
8051-12C
Max I/o Pins
32
Spi
1
Uart
1
Sram (kbytes)
0.25
Eeprom (bytes)
2048
Operating Voltage (vcc)
2.7 to 5.5
Timers
3
Isp
SPI
Watchdog
Yes
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Manufacturer
Quantity
Price
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17. Idle Mode
3286P–MICRO–3/10
Figure 16-5. Ceramic Resonator Clock Source (B)
To drive the device from an external clock source, XTAL2 should be left unconnected while
XTAL1 is driven, as shown in
Figure 16-6. External Clock Drive Configuration
In idle mode, the CPU puts itself to sleep while all the on-chip peripherals remain active. This
mode is invoked by software. The content of the on-chip RAM and all the special functions regis-
ters remain unchanged during this mode. The idle mode can be terminated by any enabled
interrupt or by a hardware reset.
Note that when idle mode is terminated by a hardware reset, the device normally resumes pro-
gram execution from where it left off, up to two machine cycles before the internal reset
algorithm takes control. On-chip hardware inhibits access to internal RAM in this event, but
access to the port pins is not inhibited. To eliminate the possibility of an unexpected write to a
port pin when idle mode is terminated by a reset, the instruction following the one that invokes
idle mode should not write to a port pin or to external memory.
7
6
5
4
3
2
1
0
0
4
Ceramic Resonator Clock Input
Figure
8
16-6.
Frequency (MHz)
12
16
20
AT89S8253
C2=0pF
C2=5pF
C2=10pF
R1=4MΩ
24
35