参数资料
型号: MCF51AG128VQH
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: RISC MICROCONTROLLER, PQFP64
封装: 14 X 14 MM, PLASTIC, QFP-64
文件页数: 24/50页
文件大小: 1630K
代理商: MCF51AG128VQH
MCF51AG128 ColdFire Microcontroller, Rev. 5
Preliminary Electrical Characteristics
Freescale Semiconductor
30
2.12
AC Characteristics
This section describes ac timing characteristics for each peripheral system.
2.12.1
Control Timing
Figure 11. Reset Timing
Table 16. Control Timing
Num
C
Parameter
Symbol
Min
Typ1
1 Typical values are based on characterization data at V
DD = 5.0 V, 25 °C unless otherwise stated.
Max
Unit
1
D
Bus frequency (tcyc = 1/fBus)fBus
dc
24
MHz
2
D
Internal low-power oscillator period
tLPO
800
1500
μs
3
D
External reset pulse width2
(tcyc = 1/fSelf_reset)
2 This is the shortest pulse that is guaranteed to be recognized as a RESET pin request. Shorter pulses are not guaranteed to
override reset requests from internal sources.
textrst
100
ns
4
D
Reset low drive
trstdrv
66 x tcyc
——
ns
5
D
Active background debug mode latch setup time
tMSSU
500
ns
6
D
Active background debug mode latch hold time
tMSH
100
ns
7
D
IRQ pulse width
Asynchronous path2
Synchronous path3
3 This is the minimum pulse width that is guaranteed to pass through the pin synchronization circuitry. Shorter pulses may or
may not be recognized. In stop mode, the synchronizer is bypassed so shorter pulses can be recognized in that case.
tILIH, tIHIL
100
1.5 x tcyc
——
ns
8
Port rise and fall time (load = 30 pF for SPI, rest 50 pF)4
Slew rate control disabled (PTxSE = 0) High drive
Slew rate control enabled (PTxSE = 1) High drive
Slew rate control disabled (PTxSE = 0) Low drive
Slew rate control enabled (PTxSE = 1) Low drive
4 Timing is shown with respect to 20% V
DD and 80% VDD levels. Temperature range –40°C to 105°C.
tRise, tFall
11
35
40
75
ns
textrst
RESET PIN
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