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参数资料
| 型号： | IS80C52-24PL |
| 厂商： | INTEGRATED SILICON SOLUTION INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 24 MHz, MICROCONTROLLER, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 7/48页 |
| 文件大小： | 379K |
| 代理商： | IS80C52-24PL |
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IS80C52
IS80C32
Integrated Silicon Solution, Inc. — 1-800-379-4774
15
MC004-1D
11/19/98
ISSI
TIMER/COUNTERS
The IS80C52/32 has three 16-bit Timer/Counter registers:
Timer 0, Timer 1, and in addition Timer 2. All three can be
configured to operate either as Timers or event Counters.
As a Timer, the register is incremented every machine
cycle. Thus, the register counts machine cycles. Since a
machine cycle consists of 12 oscillator periods, the count
rate is 1/12 of the oscillator frequency.
As a Counter, the register is incremented in response to
a 1-to-0 transition at its corresponding external input pin,
T0, T1, and T2. The external input is sampled during S5P2
of every machine cycle. When the samples show a high
in one cycle and a low in the next cycle, the count is
incremented. The new count value appears in the register
during S3P1 of the cycle following the one in which the
transition was detected. Since two machine cycles (24
oscillator periods) are required to recognize a 1-to-0
transition, the maximum count rate is 1/24 of the oscillator
frequency. There are no restrictions on the duty cycle of
the external input signal, but it should be held for at least
one full machine cycle to ensure that a given level is
sampled at least once before it changes.
In addition to the Timer or Counter functions, Timer 0 and
Timer 1 have four operating modes: (13-bit timer, 16-bit
timer, 8-bit auto-reload, split timer). Timer 2 in the IS80C52/
32 has three modes of operation: Capture, Auto-Reoload,
and Baud Rate Generator.
Timer 0 and Timer 1
Timer/Counters 0 and 1 are present in both the IS80C51/
31 and IS80C52/32. The Timer or Counter function is
selected by control bits C/T in the Special Function
Regiser TMOD. These two Timer/Counters have four
operating modes, which are selected by bit pairs (M1, M0)
in TMOD. Modes 0, 1, and 2 are the same for both Timer/
Counters, but Mode 3 is different. The four modes are
described in the following sections.
Mode 0:
Both Timers in Mode 0 are 8-bit Counters with a divide-by-
32 prescaler. Figure 8 shows the Mode 0 operation as it
applies to Timer 1.
In this mode, the Timer register is configured as a 13-bit
register. As the count rolls over from all 1s to all 0s, it sets
the Timer interrupt flag TF1. The counted input is enabled
to the Timer when TR1 = 1 and either GATE = 0 or
INT1
= 1. Setting GATE = 1 allows the Timer to be controlled by
external input
INT1,tofacilitatepulsewidthmeasurements.
TR1 is a control bit in the Special Function Register
TCON. Gate is in TMOD.
The 13-bit register consists of all eight bits of TH1 and the
lower five bits of TL1. The upper three bits of TL1 are
indeterminate and should be ignored. Setting the run flag
(TR1) does not clear the registers.
Mode 0 operation is the same for Timer 0 as for Timer 1,
except that TR0, TF0 and
INT0 replace the corresponding
Timer 1 signals in Figure 8. There are two different GATE
bits, one for Timer 1 (TMOD.7) and one for Timer 0
(TMOD.3).
TIMER
CLOCK
TL1
(8 BITS)
TH1
(8 BITS)
TF1
OVERFLOW
FLAG
Figure 9. Timer/Counter 1 Mode 1: 16-Bit Counter
DIVIDE 12
OSC
(XTAL2)
TL1
(5 BITS)
TH1
(8 BITS)
TF1
CONTROL
C/T = 0
C/T = 1
GATE
INT1 PIN
TR1
T1 PIN
INTERRUPT
P1
S1
S2
S3
ONE MACHINE
CYCLE
ONE MACHINE
CYCLE
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
P2
P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2 P1 P2
P1 P2
Figure 8. Timer/Counter 1 Mode 0: 13-Bit Counter
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IS80C52-24PLI | 制造商:ISSI 制造商全称:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
| IS80C52-24PQ | 制造商:ISSI 制造商全称:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
| IS80C52-24PQI | 制造商:ISSI 制造商全称:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
| IS80C52-24W | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| IS80C52-24WI | 制造商:ISSI 制造商全称:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
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