參數(shù)資料
型號： P87C591SFA
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： Single-chip 8-bit microcontroller with CAN controller
中文描述： 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, SOT-187-2, LCC-44
文件頁數(shù)： 64/161頁
文件大?。?/td> 588K
代理商： P87C591SFA
1999 Aug 19
64
Philips Semiconductors
Objective Specification
Single-chip 8-bit microcontroller with CAN controller
P8xC591
14.3.4
B
AUD
R
ATE IN
M
ODE
0
The baud rate in Mode 0 is fixed to:
14.3.5
B
AUD
R
ATE IN
M
ODE
2
The baud rate in Mode 2 depends on the value of bit
SMOD1 in Special Function Register PCON. If SMOD1 =
0 (which is the value after reset), the baud rate is
1
32
of
oscillator frequency. If SMOD1 = 1, the baud rate is
1
16
of
the oscillator frequency:
SMOD1
32
14.3.6
B
AUD
R
ATE IN
M
ODE
1
AND
3
In these modes the baud rate is variable and can be
generated alternatively by a baud rate generator or by
Timer 1.
Mode 0 baud rate
oscillator 6
=
Mode 2 baud rate
2
oscillator frequency
×
=
14.3.7
U
SING THE
I
NTERNAL
B
AUD
R
ATE
G
ENERATOR
In Modes 1 and 3, the P8xC591 can use an internal baud
rate generator for the serial port. To enable this feature, bit
SPS (bit 7 of Special Function Register S0PSH) must be
set. Bit SMOD1 (PCON.7) controls a divide-by-2 circuit
which affect the input and output clock signal of the baud
rate generator. After reset the divide-by-2 circuit is active
and the resulting overflow output clock will be divided by 2.
The input clock of the baud rate generator is f
CLK.
The baud rate generator consists of its own free running
upward counting 12-bit timer. On overflow of this timer
(next count step after counter value FFFH) there is an
automatic 12-bit reload from the registers S0PSL and
S0PSH. The lower 8 bits of the timer are reloaded from
S0PSL, while the upper four bits are reloaded from bit 0 to
3 of register S0PSH. The baud rate timer is reloaded by
writing to S0PSH.
Fig.24 Serial Port Input Clock when using the Baud Rate Generator.
Note: The switch configuration shows the reset state.
handbook, full pagewidth
MHI025
BAUD
RATE
CLOCK
BAUD RATE
fCLK
PCON.7
(SMOD1)
0
1
÷
2
12 BIT TIMER
S0PSH
S0PSL
overflow
input
clock
.3 .2 .1 .0
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相關代理商/技術參數(shù)
參數(shù)描述
P87C591VFA/00,512 功能描述:8位微控制器 -MCU 80C51 16K OTP/CAN RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
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