- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄3792 > P87C52SBAA,512 (NXP Semiconductors)IC 80C51 MCU 8K OTP 44-PLCC PDF資料下載
參數(shù)資料
| 型號(hào)： | P87C52SBAA,512 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 6/38頁 |
| 文件大小： | 0K |
| 描述： | IC 80C51 MCU 8K OTP 44-PLCC |
| 產(chǎn)品培訓(xùn)模塊： | Migrating from 8/16-Bit MCUs to 32-Bit ARMs |
| 標(biāo)準(zhǔn)包裝： | 26 |
| 系列： | 87C |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 16MHz |
| 連通性： | EBI/EMI，UART/USART |
| 外圍設(shè)備： | POR |
| 輸入/輸出數(shù)： | 32 |
| 程序存儲(chǔ)器容量： | 8KB（8K x 8） |
| 程序存儲(chǔ)器類型： | OTP |
| RAM 容量： | 256 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 V ~ 5.5 V |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | 0°C ~ 70°C |
| 封裝/外殼： | 44-LCC（J 形引線） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 705 (CN2011-ZH PDF) |
| 其它名稱： | 568-1247-5 935252870512 P87C52SBAA |
第1頁第2頁第3頁第4頁第5頁當(dāng)前第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁
Philips Semiconductors
Product specification
80C51/87C51/80C52/87C52
80C51 8-bit microcontroller family
4 K/8 K OTP/ROM low voltage (2.7 V–5.5 V),
low power, high speed (33 MHz), 128/256 B RAM
2000 Aug 07
14
Baud Rate Generator Mode
Bits TCLK and/or RCLK in T2CON (Table 3) allow the serial port
transmit and receive baud rates to be derived from either Timer 1 or
Timer 2. When TCLK= 0, Timer 1 is used as the serial port transmit
baud rate generator. When TCLK= 1, Timer 2 is used as the serial
port transmit baud rate generator. RCLK has the same effect for the
serial port receive baud rate. With these two bits, the serial port can
have different receive and transmit baud rates – one generated by
Timer 1, the other by Timer 2.
Figure 6 shows the Timer 2 in baud rate generation mode. The baud
rate generation mode is like the auto-reload mode, in that a rollover
in TH2 causes the Timer 2 registers to be reloaded with the 16-bit
value in registers RCAP2H and RCAP2L, which are preset by
software.
The baud rates in modes 1 and 3 are determined by Timer 2’s
overflow rate given below:
Modes 1 and 3 Baud Rates
+ Timer 2 Overflow Rate
16
The timer can be configured for either “timer” or “counter” operation.
In many applications, it is configured for “timer” operation (C/T2*=0).
Timer operation is different for Timer 2 when it is being used as a
baud rate generator.
Usually, as a timer it would increment every machine cycle (i.e., 1/12
the oscillator frequency). As a baud rate generator, it increments
every state time (i.e., 1/2 the oscillator frequency). Thus the baud
rate formula is as follows:
Oscillator Frequency
[32
[65536
* (RCAP2H, RCAP2L)]]
Modes 1 and 3 Baud Rates =
Where:
(RCAP2H, RCAP2L)= The content of RCAP2H and
RCAP2L taken as a 16-bit unsigned integer.
The Timer 2 as a baud rate generator mode shown in Figure 6, is
valid only if RCLK and/or TCLK = 1 in T2CON register. Note that a
rollover in TH2 does not set TF2, and will not generate an interrupt.
Thus, the Timer 2 interrupt does not have to be disabled when
Timer 2 is in the baud rate generator mode. Also if the EXEN2
(T2 external enable flag) is set, a 1-to-0 transition in T2EX
(Timer/counter 2 trigger input) will set EXF2 (T2 external flag) but
will not cause a reload from (RCAP2H, RCAP2L) to (TH2,TL2).
Therefore when Timer 2 is in use as a baud rate generator, T2EX
can be used as an additional external interrupt, if needed.
When Timer 2 is in the baud rate generator mode, one should not try
to read or write TH2 and TL2. As a baud rate generator, Timer 2 is
incremented every state time (osc/2) or asynchronously from pin T2;
under these conditions, a read or write of TH2 or TL2 may not be
accurate. The RCAP2 registers may be read, but should not be
written to, because a write might overlap a reload and cause write
and/or reload errors. The timer should be turned off (clear TR2)
before accessing the Timer 2 or RCAP2 registers.
Table 4 shows commonly used baud rates and how they can be
obtained from Timer 2.
Table 4.
Timer 2 Generated Commonly Used
Baud Rates
Ba d Rate
Osc Freq
Timer 2
Baud Rate
Osc Freq
RCAP2H
RCAP2L
375 K
12 MHz
FF
9.6 K
12 MHz
FF
D9
2.8 K
12 MHz
FF
B2
2.4 K
12 MHz
FF
64
1.2 K
12 MHz
FE
C8
300
12 MHz
FB
1E
110
12 MHz
F2
AF
300
6 MHz
FD
8F
110
6 MHz
F9
57
Summary Of Baud Rate Equations
Timer 2 is in baud rate generating mode. If Timer 2 is being clocked
through pin T2(P1.0) the baud rate is:
Baud Rate
+ Timer 2 Overflow Rate
16
If Timer 2 is being clocked internally, the baud rate is:
Baud Rate
+
f
OSC
[32
[65536
* (RCAP2H, RCAP2L)]]
Where fOSC= Oscillator Frequency
To obtain the reload value for RCAP2H and RCAP2L, the above
equation can be rewritten as:
RCAP2H, RCAP2L
+ 65536 *
f
OSC
32
Baud Rate
Timer/Counter 2 Set-up
Except for the baud rate generator mode, the values given for
T2CON do not include the setting of the TR2 bit. Therefore, bit TR2
must be set, separately, to turn the timer on. See Table 5 for set-up
of Timer 2 as a timer. Also see Table 6 for set-up of Timer 2 as a
counter.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC68HC908EY16MFA | MCU 8-BIT 16K FLASH 32-LQFP |
| MC68HC11K1CFUE4 | MCU 8-BIT 768 RAM 4MHZ 80-QFP |
| MC68HC11K1CFUE3 | MCU 8-BIT 768 RAM 3MHZ 80-QFP |
| MC9S08AW16MFDE | IC MCU 8BIT 16K FLASH 48-QFN |
| MC68HC11K1CFNE4R | MCU 8-BIT 768 RAM 4MHZ 84-PLCC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| P87C52SBAA-T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| P87C52SBBB | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit CMOS (low voltage, low power and high speed) microcontroller families |
| P87C52SBBB,557 | 功能描述:8位微控制器 -MCU 80C51 8K/256 OTP 16MHZ 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT |
| P87C52SBBB557 | 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
| P87C52SBBB-S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。