參數(shù)資料
型號(hào)： P87C32X2
廠商： NXP Semiconductors N.V.
英文描述： 80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage 2.7 to 5.5 V, low power, high speed 30/33 MHz
中文描述： 80C51的8位單片機(jī)系列4K/8K/16K/32K的ROM / RAM的檢察官辦公室128B/256B低電壓2.7至5.5 V，低功耗，高速33分之30兆赫
文件頁(yè)數(shù)： 22/62頁(yè)
文件大?。?/td> 403K
代理商： P87C32X2
Philips Semiconductors
Product data
P80C3xX2; P80C5xX2;
P87C5xX2
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V),
low power, high speed (30/33 MHz)
2003 Jan 24
22
Table 5. Timer 2 Generated Commonly Used
Baud Rates
Baud Rate
Timer 2
12-clk
mode
6-clk
mode
Osc Freq
RCAP2H
RCAP2L
375 K
9.6 K
4.8 K
2.4 K
1.2 K
300
110
300
110
750 K
19.2 K
9.6 K
4.8 K
2.4 K
600
220
600
220
12 MHz
12 MHz
12 MHz
12 MHz
12 MHz
12 MHz
12 MHz
6 MHz
6 MHz
FF
FF
FF
FF
FE
FB
F2
FD
F9
FF
D9
B2
64
C8
1E
AF
8F
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:
Timer 2 Overflow Rate
16
If Timer 2 is being clocked internally, the baud rate is:
Baud Rate
Baud Rate
f
OSC
(RCAP2H,RCAP2L)]]
[n
[65536
Where:
n = 16 in 6-clock mode, 32 in 12-clock mode.
f
OSC
= Oscillator Frequency
To obtain the reload value for RCAP2H and RCAP2L, the above
equation can be rewritten as:
RCAP2H,RCAP2L
65536
f
OSC
Baud Rate
n
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 6 for set-up
of Timer 2 as a timer. Also see Table 7 for set-up of Timer 2 as a
counter.
Table 6. Timer 2 as a Timer
T2CON
MODE
INTERNAL
CONTROL
(Note 1)
00H
EXTERNAL
CONTROL
(Note 2)
08H
16-bit Auto-Reload
16-bit Capture
01H
09H
Baud rate generator receive
and transmit same baud rate
Receive only
34H
36H
24H
26H
Transmit only
14H
16H
Table 7. Timer 2 as a Counter
TMOD
MODE
INTERNAL
CONTROL
(Note 1)
02H
EXTERNAL
CONTROL
(Note 2)
0AH
16-bit
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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