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參數(shù)資料
| 型號： | P8242AH |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | UNIVERSAL PERIPHERAL INTERFACE 8-BIT SLAVE MICROCONTROLLER |
| 中文描述： | 8-BIT, MROM, 12.5 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 243K |
| 代理商： | P8242AH |
UPI-41AH/42AH
SYNC MODE
The Sync Mode is provided to ease the design of
multiple controller circuits by allowing the designer
to force the device into known phase and state time.
The Sync Mode may also be utilized by automatic
test equipment (ATE) for quick, easy, and efficient
synchronizing between the tester and the DUT (de-
vice under test).
Sync Mode is enabled when SS pin is raised to high
voltage level of
a
12 volts. To begin synchroniza-
tion, T0 is raised to 5 volts at least four clock cycles
after SS. T0 must be high for at least four X1 clock
cycles to fully reset the prescaler and time state
generators. T0 may then be brought down during
low state of X1. Two clock cycles later, with the ris-
ing edge of X1, the device enters into Time State 1,
Phase 1. SS is then brought down to 5 volts 4 clocks
later after T0. RESET is allowed to go high 5 tCY (75
clocks) later for normal execution of code.
SYNC MODE TIMING DIAGRAMS
210393–28
Minimum Specifications
SYNC Operation Time, t
SYNC
e
3.5 XTAL 1 Clock cycles. Reset Time, t
RS
e
4 t
CY
.
NOTE:
The rising and falling edges of T0 should occur during low state of XTAL1 clock.
10
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