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P80C31X2 View Datasheet(PDF) - NXP Semiconductors.

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P80C31X2 Datasheet PDF : 62 Pages
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Philips Semiconductors
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)
Product data
P80C3xX2; P80C5xX2;
P87C5xX2
Table 5. Timer 2 Generated Commonly Used
Baud Rates
Baud Rate
12-clk
mode
6-clk
mode
Osc Freq
Timer 2
RCAP2H RCAP2L
375 K
750 K
12 MHz
FF
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
16
Rate
If Timer 2 is being clocked internally, the baud rate is:
Baud Rate + [n
Where:
fOSC
[65536 * (RCAP2H, RCAP2L)]]
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:
ǒ Ǔ RCAP2H, RCAP2L + 65536 * n
fOSC
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.
2003 Jan 24
22
 

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