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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： | 15/48页 |
| 文件大小： | 379K |
| 代理商： | IS80C52-24PL |
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IS80C52
IS80C32
22
Integrated Silicon Solution, Inc. — 1-800-379-4774
MC004-1D
11/19/98
ISSI
Using Timer 2 to Generate Baud Rates
In the IS80C52/32, setting TCLK and/or RCLK in T2CON
selects Timer 2 as the baud rate generator. Under these
conditions, the baud rates for transmit and receive can be
simultaneously different. Setting RCLK and/or TCLK puts
Timer 2 into its baud rate generator mode, as shown in
Figure 14.
The baud rate generator mode is similar to the auto-reload
mode, in that a rollover in TH2 reloads the Timer 2
registers with the 16-bit value in the RCAP2H and RCAP2L
registers, which are preset by software.
In this case, the baud rates in Mode 1 and 3 are determined
by the Timer 2 overflow rate according to the following
equation.
Modes 1, 3 Baud Rate =
Timer 2 Overflow Rate
16
Timer 2 can be configured for either timer or counter
operation. In the most typical applications, it is configured
for timer operation (C/T2 = 0). Normally, a timer increments
every machine cycle (thus at 1/12 the oscillator frequency),
but timer operation is a different for Timer 2 when it is used
as a baud rate generator. As a baud rate generator, Timer
2 increments every state time (thus at 1/2 the oscillator
frequency). In this case, the baud rate is given by the
following formula.
Modes 1, 3
Oscillator Frequency
Baud Rate
=
32x [65536 – (RCAP2H, RCAP2L)]
Where (RCAP2H, RCAP2L) is the content of RCAP2H
and RCAP2L taken as a 16-bit unsigned integer.
Figure 13 shows Timer 2 as a baud rate generator. This
figure is valid only if RCLK + TCLK = 1 in T2CON. A
rollover in TH2 does not set TF2 and does no generate an
interrupt. Therefore, the Timer 2 interrupt does not have
to be disabled when Timer 2 is in the baud rate generator
mode. If EXEN2 is set, a 1-to-0 transition in T2EX sets
EXF2 but does not cause a reload from (RCAP2H,
RCAP2L) to (TH2, TL2). Thus, when Timer 2 is used as
a baud rate generator, T2EX can be used as an extra
external interrupt.
When Timer 2 is running (TR2 = 1) as a timer in the baud
rate generator mode, programmers should not read from
or write to TH2 or TL2. Under these conditions, Timer 2 is
incremented every state time, and the results of a read or
write may not be accurate. The RCAP registers may be
read, but should not be written to, because a write might
overlap a reload and cause write and/or reload errors.
Turn Timer 2 off (clear TR2) before accessing the Timer
2 or RCAP registers, in this case.
Table 9. Commonly Used Baud Rates Generated by Timer 1
Timer 1
Baud Rate
fOSC
SMOD
C/T
Mode
Reload Value
Mode 0 Max: 1 MHz
12 MHz
X
Mode 2 Max: 375K
12 MHz
1
X
Modes 1, 3: 62.5K
12 MHz
1
0
2
FFH
19.2K
11.059 MHz
1
0
2
FDH
9.6K
11.059 MHz
0
2
FDH
4.8K
11.059 MHz
0
2
FAH
2.4K
11.059 MHz
0
2
F4H
1.2K
11.059 MHz
0
2
E8H
137.5
11.986 MHz
0
2
1DH
110
6 MHz
0
2
72H
110
12 MHz
0
1
FEEBH
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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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