參數(shù)資料
型號： SDA 5252
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)： 81/143頁
文件大?。?/td> 1050K
代理商： SDA 5252
SDA 525x
Semiconductor Group
81
1998-04-08
Timer/Counter 0: Mode Selection
Timer/counter 0 can be configured in one of four operating modes, which are selected
by bit-pairs (M1, M0) in TMOD-register (see
page 83
).
– Mode 0
Putting timer/counter 0 into mode 0 makes it look like an 8048 timer, which is an 8-bit
counter with a divide-by-32 prescaler.
Figure 25
shows the mode 0 operation as it
applies to timer 0.
In this mode, the timer register is configured as a 13-bit register. As the count rolls over
from all 1 s to all 0 s, it sets the timer interrupt flag TF0. The counted input is enabled to
the timer when TR0 = 1 and either GATE = 0 or INT0 = 1. (Setting GATE = 1 allows the
timer to be controlled by external input INT0, to facilitate pulse width measurements.)
TR0 is a control bit in the special function register TCON (see
page 84
). GATE is
contained in register TMOD (see
page 83
).
The 13-bit register consists of all 8 bits of TH0 and the lower 5 bits of TL0. The upper 3
bits of TL0 are indeterminate and should be ignored. Setting the run flag (TR0) does not
clear the registers.
– Mode 1
Mode 1 is the same as mode 0, except that the timer/counter 0 register is being run with
all 16 bits.
– Mode 2
Mode 2 configures the timer/counter 0 register as an 8-bit counter (TL0) with automatic
reload, as shown on see
page 83
. Overflow from TL0 not only sets TF0, but also reloads
TL0 with the contents of TH0, which is preset by software. The reload leaves TH0
unchanged.
– Mode 3
Timer/counter 0 in mode 3 establishes TL0 and TH0 as two separate counters. The logic
for mode 3 on timer 0 is shown in
Figure 27
. TL0 uses the timer 0 control bits: C/T,
GATE, TR0, INT0 and TF0. TH0 is locked into a timer function (counting machine cycles)
and takes over the use of TR1 and TF1 from timer 1. Thus, TH0 now controls the “timer
1” interrupt.
Mode 3 is provided for applications requiring an extra 8-bit timer or counter. With timer
0 in mode 3, the processor can operate as if it has three timers/counters. When timer 0
is in mode 3, timer 1 can be turned on and off by switching it out of and into its own mode
3, or can still be used in any application not requiring an interrupt.
相關(guān)PDF資料
PDF描述
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 ）)
SDA 5255 TVTEXT 8-Bit Microcontroller(ROM-Versions )(TV視頻的8位微控制器（含ROM 型 ）)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SDA5252-2 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics
SDA5252M 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics
SDA5252M-2 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics
SDA5254 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics
SDA5254-2 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics
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