参数资料
型号: P80C31X2BN,112
厂商: NXP Semiconductors
文件页数: 15/62页
文件大小: 0K
描述: IC 80C51 MCU 128 ROMLESS 40DIP
标准包装: 9
系列: 80C
核心处理器: 8051
芯体尺寸: 8-位
速度: 33MHz
连通性: EBI/EMI,UART/USART
外围设备: POR
输入/输出数: 32
程序存储器类型: ROMless
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 40-DIP(0.600",15.24mm)
包装: 管件
其它名称: 935269613112
P80C31X2BN
P80C31X2BN-ND
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
750 K
12 MHz
FF
9.6 K
19.2 K
12 MHz
FF
D9
4.8 K
9.6 K
12 MHz
FF
B2
2.4 K
4.8 K
12 MHz
FF
64
1.2 K
2.4 K
12 MHz
FE
C8
300
600
12 MHz
FB
1E
110
220
12 MHz
F2
AF
300
600
6 MHz
FD
8F
110
220
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
[n
[65536
* (RCAP2H, RCAP2L)]]
Where:
n = 16 in 6-clock mode, 32 in 12-clock mode.
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 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)
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 7. 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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