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參數(shù)資料
| 型號： | P80CL580 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Low voltage 8-bit microcontrollers with UART, I2C-bus and ADC |
| 中文描述： | 低電壓8 - UART的，位微控制器的I2C總線和ADC |
| 文件頁數(shù)： | 35/80頁 |
| 文件大?。?/td> | 366K |
| 代理商： | P80CL580 |
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1997 Mar 14
35
Philips Semiconductors
Product specification
Low voltage 8-bit microcontrollers with
UART, I
2
C-bus and ADC
P80CL580; P83CL580
16.3
Baud rates
The baud rate in Mode 0 is fixed and may be calculated as:
f
The baud rate in Mode 2 depends on the value of the
SMOD bit in Special Function Register PCON and may be
calculated as:
SMOD
64
If SMOD = 0 (value on reset), the baud rate is
1
64
×
f
osc
If SMOD = 1, the baud rate is
1
32
×
f
osc
The baud rates in Modes 1 and 3 are determined by the
Timer 1 or Timer 2 overflow rate.
16.3.1
U
SING
T
IMER
1
TO GENERATE BAUD RATES
When Timer 1 is used as the Baud Rate Generator, the
baud rates in Modes 1 and 3 are determined by the
Baud Rate
-12
=
Baud Rate
2
f
osc
×
=
Timer 1 overflow rate and the value of the SMOD bit as
follows:
The Timer 1 interrupt should be disabled in this
application. The Timer itself can be configured for either
‘timer’ or ‘counter’ operation in any of its 3 running modes.
In most typical applications, it is configured for ‘timer’
operation, in the Auto-reload mode (high nibble of
TMOD = 0010B). In this case the baud rate is given by the
formula:
SMOD
32
12
×
{
By configuring Timer 1 to run as a 16-bit timer (high nibble
of TMOD = 0001B), and using the Timer 1 interrupt to do
a 16-bit software reload, very low baud rates can be
achieved. Table 33 lists commonly used baud rates and
how they can be obtained from Timer 1.
Baud Rate
SMOD
32
2
Timer 1 Overflow Rate.
×
=
Baud Rate
2
osc
256
TH1
–
(
)
}
----------------------f
×
=
Table 33
Commonly used baud rates generated by Timer 1
Notes
1.
2.
3.
4.
Maximum in Mode 0.
X = don’t care.
Maximum in Mode 2.
Maximum in Modes 1 and 3.
BAUD RATE(kb/s)
1000.0
(1)
375.0
(3)
62.5
(4)
19.2
9.6
4.8
2.4
1.2
137.5
110.0
110.0
f
osc
(MHz)
12.000
12.000
12.000
11.059
11.059
11.059
11.059
11.059
11.986
6.000
12.000
SMOD
X
(2)
1
1
1
0
0
0
0
0
0
0
C/T
TIMER 1 MODE
RELOAD VALUE
X
X
0
0
0
0
0
0
0
0
0
X
X
X
X
Mode 2
Mode 2
Mode 2
Mode 2
Mode 2
Mode 2
Mode 2
Mode 2
Mode 1
FFH
FDH
FDH
FAH
F4H
E8H
1DH
72H
FEEBH
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| P80CL580HFH | 制造商:NXP Semiconductors 功能描述: |
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