DataSheet.es AT89LV55-12PI Hoja de datos PDF


PDF AT89LV55-12PI Datasheet ( Hoja de datos )

Número de pieza AT89LV55-12PI
Descripción 8-Bit Microcontroller with 20K Bytes Flash
Fabricantes ATMEL Corporation 
Logotipo ATMEL Corporation Logotipo
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AT89LV55-12PI datasheet

1 Page

AT89LV55-12PI pdf
AT89LV55
Table 1. AT89LV55 SFR Map and Reset Values
0F8H
0F0H
0E8H
0E0H
0D8H
0D0H
0C8H
0C0H
0B8H
0B0H
0A8H
0A0H
98H
90H
88H
80H
B
00000000
ACC
00000000
PSW
00000000
T2CON
00000000
IP
XX000000
P3
11111111
IE
0X000000
P2
11111111
SCON
00000000
P1
11111111
TCON
00000000
P0
11111111
T2MOD
XXXXXX00
SBUF
XXXXXXXX
TMOD
00000000
SP
00000111
RCAP2L
00000000
TL0
00000000
DPL
00000000
RCAP2H
00000000
TL1
00000000
DPH
00000000
TL2
00000000
TH0
00000000
TH2
00000000
TH1
00000000
0FFH
0F7H
0EFH
0E7H
0DFH
0D7H
0CFH
0C7H
0BFH
0B7H
0AFH
0A7H
9FH
97H
8FH
PCON
0XXX0000
87H
4-197

5 Page

AT89LV55-12PI arduino
Baud Rate Generator
Timer 2 is selected as the baud rate generator by setting
TCLK and/or RCLK in T2CON (Table 2). Note that the baud
rates for transmit and receive can be different if Timer 2 is
used for the receiver or transmitter and Timer 1 is used for
the other function. Setting RCLK and/or TCLK puts Timer 2
into its baud rate generator mode, as shown in Figure 4.
The baud rate generator mode is similar to 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 according to the following equation.
Modes 1 and 3 Baud Rates = T----i-m-----e----r----2-----O----v1---e-6---r--f-l--o---w------R----a----t-e--
The Timer can be configured for either timer or counter
operation. In most applications, it is configured for timer
operation (CP/T2 = 0). The timer operation is different for
Timer 2 when it is used as a baud rate generator. Normally,
as a timer, it increments every machine cycle (at 1/12 the
oscillator frequency). As a baud rate generator, however, it
increments every state time (at 1/2 the oscillator fre-
quency). The baud rate formula is given below.
Figure 5. Timer 2 in Clock-Out Mode
M------oB---d-a--e--u--s-d---1--R---a-a---n-t-e-d-----3-- = 3----2-----×-----[--6-O--5----s5---3c---6i--l-l--a–---t--(o--R--r--C--F---A-r--e-P---q-2---uH----e,--R-n---C-c---y-A----P----2---L----)---]
where (RCAP2H, RCAP2L) is the content of RCAP2H and
RCAP2L taken as a 16-bit unsigned integer.
Timer 2 as a baud rate generator is shown in Figure 4. This
figure is valid only if RCLK or TCLK = 1 in T2CON. Note
that a rollover in TH2 does not set TF2 and will not gener-
ate an interrupt. Note too, that if EXEN2 is set, a l-to-0 tran-
sition in T2EX will set EXF2 but will not cause a reload from
(RCAP2H, RCAP2L) to (TH2, TL2). Thus when Timer 2 is
in use as a baud rate generator, T2EX can be used as an
extra external interrupt.
Note that when Timer 2 is running (TR2 = 1) as a timer in
the baud rate generator mode, TH2 or TL2 should not be
read from or written to. Under these conditions, the Timer is
incremented every state time, and the results of a read or
write 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.
4-202 AT89LV55

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