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ST7263B bảng dữ liệu(PDF) 101 Page - STMicroelectronics

tên linh kiện ST7263B
Giải thích chi tiết về linh kiện  LOW SPEED USB 8-BIT MCU FAMILY WITH FLASH/ROM, UP TO 512 BYTES RAM, 8-BIT ADC, WDG, TIMER, SCI & I²C
PDF  132 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST7263B bảng dữ liệu(HTML) 101 Page - STMicroelectronics

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13.5 CLOCK AND TIMING CHARACTERISTICS
Subject to general operating conditions for VDD, fCPU, and TA.
13.5.1 General Timings
1. Data based on typical application software.
2. Time measured between interrupt event and interrupt vector fetch.
∆t
c(INST) is the number of tCPU cycles needed to finish
the current instruction execution.
13.5.2 CONTROL TIMING CHARACTERISTICS
Note 1: The minimum period t
ILIL should not be less than the number of cycle times it takes to execute the
interrupt service routine plus 21 cycles.
Symbol
Parameter
Conditions
Min
Typ 1)
Max
Unit
tc(INST)
Instruction cycle time
fCPU=8MHz
2
3
12
tCPU
250
375
1500
ns
tv(IT)
Interrupt reaction time 2)
tv(IT) = ∆tc(INST) + 10 tCPU
fCPU=8MHz
10
22
tCPU
1.25
2.75
µs
CONTROL TIMINGS
Symbol
Parameter
Conditions
Value
Unit
Min
Typ.
Max
fOSC
Oscillator Frequency
24
MHz
fCPU
Operating Frequency
8
MHz
tRL
External RESET
Input pulse Width
1.5
tCPU
tPORL
Internal Power Reset Duration
514
tCPU
TDOGL
Watchdog or Low Voltage Reset
Output Pulse Width
200
ns
tDOG
Watchdog Time-out
fcpu = 8MHz
49152
6.144
3145728
393.216
tCPU
ms
tOXOV
Crystal Oscillator
Start-up Time
20
30
40
ms
tDDR
Power up rise time
from VDD = 0 to 4V
100
ms



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