參數(shù)資料
型號(hào)： SDA 5251
廠商： SIEMENS AG
英文描述： TVTEXT 8-Bit Microcontroller(ROM-Versions )(TV視頻的8位微控制器（含ROM 型 ）)
中文描述： TVTEXT 8位微控制器（ROM的版本）（電視視頻的8位微控制器（含光盤型））
文件頁數(shù)： 75/143頁
文件大?。?/td> 1050K
代理商： SDA 5251
SDA 525x
Semiconductor Group
75
1998-04-08
Note: values without brackets apply for CDC = 1 and values in brackets for CDC = 0
(see
Chapter “Advanced Function Register” on page 115
).
If an interrupt of equal or higher priority level is already in progress, the additional wait
time obviously depends on the nature of the other interrupt's service routine.
6.3.5
Processor initialization is accomplished with activation of the RST pin, which is the input
to a Schmitt Trigger. To reset the processor, this pin should be held low for at least four
machine cycles, while the oscillator is running stable. Upon powering up, RST should be
held low for at least 10 ms after the power supply stabilizes to allow the oscillator to
stabilize. Crystal operation below 6 MHz will increase the time necessary to hold RST
low. Two machine cycles after receiving of RST, the processor ceases from instruction
execution and remains dormant for the duration of the pulse. The high-going transition
then initiates a sequence which requires approximately one machine cycle to execute
before normal operation commences with the instruction at absolute location 0000
H
.
Program memory locations 0000
H
through 0002
H
are reserved for the initialization
routine of the microcomputer. This sequence ends with registers initialized as shown in
Chapter “Memory Organization” on page 49
.
After the processor is reset, all ports are written with one (1). Outputs are undefined until
the reset period is complete.
An automatic reset can be obtained when
V
DD
is turned on by connecting the RST-pin to
V
SS
through a 10
μ
F capacitor, providing the
V
DD
rise time does not exceed a millisecond
and the oscillator start-up time does not exceed 10 milliseconds. When power comes on,
the current drawn by RST-pin starts to charge the capacitor. The voltage
V
RST
at RST-pin
is the capacitor voltage, and increases to
V
DD
as the capacitor charges. The larger the
Processor Reset and Initialization
Table 19
Instruction
Time (Oscillator Periods)
Best Case
Worst Case
External interrupt generated immediately
before (best) / after (worst) the pin is
sampled (time until end of bus cycle).
Current or next instruction finishes in
12-[6-] oscillator periods
Next instruction is MUL or DIV
Internal latency for hardware subroutine
call
2 +
ε
[
1 +
ε]
12
[6]
don’t care
24
38
[12]
[19]
2 –
ε
[
1 –
ε]
12
[6]
48
[24]
24
86
[12]
[43]
相關(guān)PDF資料
PDF描述
SDA 5252 TVTEXT 8-Bit Microcontroller(ROM-Versions )(TV視頻的8位微控制器（含ROM 型 ）)
SDA 5254 TVTEXT 8-Bit Microcontroller(ROM-Versions )(TV視頻的8位微控制器（含ROM 型 ）)
SDA5254M ICs for Consumer Electronics
SDA525X ICs for Consumer Electronics
SDA 5250 TVTEXT 8-Bit Microcontroller(ROMLess-Versions )(TV視頻的8位微控制器（無ROM 型 ）)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SDA5251-2 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics
SDA5251M 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics
SDA5251M-2 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics
SDA5252 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics
SDA5252-2 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics
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