參數(shù)資料
型號(hào): AT89S2051-24SI
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-bit Microcontroller with 2K/4K Bytes Flash
中文描述: 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDSO20
封裝: 0.300 INCH, MS-013AC, PLASTIC, SOIC-20
文件頁(yè)數(shù): 15/46頁(yè)
文件大?。?/td> 1051K
代理商: AT89S2051-24SI
22
3390D–MICRO–3/07
AT89S2051/S4051
22. Power-up Sequence
Execute the following sequence to power-up the device before programming.
1.
Apply power between VCC and GND pins.
2.
After V
CC has settled, wait 10 s and bring RST to “H”.
3.
Wait 4 ms for the internal Power-on Reset to timeout.
4.
Bring P3.2 to “H” and drive P3.7, P3.5, P3.4, and P3.3 to known values, then wait
10 s.
5.
Raise RST/V
PP to 12V to enable the parallel programming modes.
6.
After V
PP has settled, wait an additional 10 s before programming.
Figure 22-1. Power-up Operation
23. Power-down Sequence
Execute the following sequence to power-down the device after programming.
1.
Tri-state Port P1.
2.
Bring RST/V
PP down from 12V to VCC and wait 10 s.
3.
Bring XTAL and P3.2 to “L” and tri-state P3.7, P3.5, P3.4, and P3.3.
4.
Bring RST to “L” and wait 10 s.
5.
Power off V
CC.
Figure 23-1. Power-down Operation
V
CC
RST/V
PP
P3.2
P3.3 - P3.7
XTAL1
RDY/BSY
P1.0 - P1.7
High Z
V
CC
RST/V
PP
P3.2
P3.3 - P3.7
XTAL1
RDY/BSY
P1.0 - P1.7
High Z
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