80C51 8-bit microcontroller family 8KB/16KB/32KB/64K" />
參數(shù)資料
型號： P87C51RA2FA,512
廠商： NXP Semiconductors
文件頁數(shù)： 13/67頁
文件大小： 0K
描述： IC 80C51 MCU 8BIT 44PLCC
標(biāo)準(zhǔn)包裝： 26
系列： 87C
核心處理器： 8051
芯體尺寸： 8-位
速度： 33MHz
連通性： EBI/EMI，UART/USART
外圍設(shè)備： POR，PWM，WDT
輸入/輸出數(shù)： 32
程序存儲器容量： 16KB（16K x 8）
程序存儲器類型： OTP
RAM 容量： 512 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： -40°C ~ 85°C
封裝/外殼： 44-LCC（J 形引線）
包裝： 管件
其它名稱： 568-8737-5
P87C51RA2FA,512-ND
Philips Semiconductors
Product data
P87C51RA2/RB2/RC2/RD2
80C51 8-bit microcontroller family 8KB/16KB/32KB/64KB OTP
with 512B/1KB RAM, low voltage (2.7 to 5.5 V), low power, high
speed (30/33 MHz)
2003 Jan 24
20
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.
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
[n *
[65536
* (RCAP2H, RCAP2L)]]
* n =
16 in 6-clock mode
32 in 12-clock mode
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
n*
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.
Table 5.
Timer 2 as a Timer
T2CON
MODE
INTERNAL CONTROL
(Note 1)
EXTERNAL CONTROL
(Note 2)
16-bit Auto-Reload
00H
08H
16-bit Capture
01H
09H
Baud rate generator receive and transmit same baud rate
34H
36H
Receive only
24H
26H
Transmit only
14H
16H
Table 6.
Timer 2 as a Counter
TMOD
MODE
INTERNAL CONTROL
(Note 1)
EXTERNAL CONTROL
(Note 2)
16-bit
02H
0AH
Auto-Reload
03H
0BH
NOTES:
1. Capture/reload occurs only on timer/counter overflow.
2. Capture/reload occurs on timer/counter overflow and a 1-to-0 transition on T2EX (P1.1) pin except when Timer 2 is used in the baud rate
generator mode.
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