參數(shù)資料
型號(hào)： IS89C52-40WI
廠(chǎng)商： INTEGRATED SILICON SOLUTION INC
元件分類(lèi)： 微控制器/微處理器
英文描述： CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH
中文描述： 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDIP40
封裝： 0.600 INCH, PLASTIC, DIP-40
文件頁(yè)數(shù)： 19/50頁(yè)
文件大?。?/td> 425K
代理商： IS89C52-40WI
IS89C52
Integrated Silicon Solution, Inc. — 1-800-379-4774
MC013-1C
11/21/98
19
ISSI
Table 5. Timer/Counter 1 Used as a Timer
TMOD
Mode
Timer 1
Function
Internal
Control
(1)
External
Control
(2)
0
13-Bit Timer
00H
80H
1
16-Bit Timer
10H
90H
2
8-Bit Auto-Reload
20H
A0H
3
Does Not Run
30H
B0H
Table 6. Timer/Counter 1 Used as a Counter
TMOD
Mode
Timer 1
Function
Internal
Control
(1)
External
Control
(2)
0
13-Bit Timer
40H
C0H
1
16-Bit Timer
50H
D0H
2
8-Bit Auto-Reload
60H
E0H
3
Not Available
—
—
Notes:
1. The Timer is turned ON/OFF by setting/clearing bit TR1
in the software.
2. The Timer is turned ON/OFF by the 1-to-0 transition on
INT1
(P3.3) when TR1 = 1 (hardware control).
Timer Setup
Tables 3 through 6 give TMOD values that can be used to
set up Timers in different modes.
It assumes that only one timer is used at a time. If Timers
0 and 1 must run simultaneously in any mode, the value in
TMOD for Timer 0 must be ORed with the value shown for
Timer 1 (Tables 5 and 6).
For example, if Timer 0 must run in Mode 1 GATE (external
control), and Timer 1 must run in Mode 2 COUNTER, then
the value that must be loaded into TMOD is 69H (09H from
Table 3 ORed with 60H from Table 6).
Moreover, it is assumed that the user is not ready at this
point to turn the timers on and will do so at another point
in the program by setting bit TRx (in TCON) to 1.
Table 3. Timer/Counter 0 Used as a Timer
TMOD
Mode
Timer 0
Function
Internal
Control
(1)
External
Control
(2)
0
13-Bit Timer
00H
08H
1
16-Bit Timer
01H
09H
2
8-Bit Auto-Reload
02H
0AH
3
Two 8-Bit Timers
03H
0BH
Table 4. Timer/Counter 0 Used as a Counter
TMOD
Mode
Timer 0
Function
Internal
Control
(1)
External
Control
(2)
0
13-Bit Timer
04H
0CH
1
16-Bit Timer
05H
0DH
2
8-Bit Auto-Reload
06H
0EH
3
One 8-Bit Counter
07H
0FH
Notes:
1. The Timer is turned ON/OFF by setting/clearing bit TR0
in the software.
2. The Timer is turned ON/OFF by the 1 to 0 transition on
INT0
(P3.2) when TR0 = 1 (hardware control).
相關(guān)PDF資料
PDF描述
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