參數資料
型號: AT89S8253-24AI
廠商: Atmel
文件頁數: 29/60頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 12K 44TQFP
標準包裝: 160
系列: 89S
核心處理器: 8051
芯體尺寸: 8-位
速度: 24MHz
連通性: SPI,UART/USART
外圍設備: POR,WDT
輸入/輸出數: 32
程序存儲器容量: 12KB(12K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-TQFP
包裝: 托盤
35
3286P–MICRO–3/10
AT89S8253
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.
Figure 16-6. External Clock Drive Configuration
17. Idle Mode
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.
Ceramic Resonator Clock Input
0
1
2
3
4
5
6
7
04
8
12
16
20
24
Frequency (MHz)
X
T
AL
1
Am
p
li
tu
d
e
(V
)
C2=0pF
C2=5pF
C2=10pF
R1=4MΩ
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