DataSheet.es AT89LS53-12JC Hoja de datos PDF


PDF AT89LS53-12JC Datasheet ( Hoja de datos )

Número de pieza AT89LS53-12JC
Descripción 8-Bit Microcontroller with 12K Bytes Flash
Fabricantes ATMEL Corporation 
Logotipo ATMEL Corporation Logotipo
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AT89LS53-12JC datasheet

1 Page

AT89LS53-12JC pdf
AT89LS53
XTAL1
Input to the inverting oscillator amplifier and input to the
internal clock operating circuit.
XTAL2
Output from the inverting oscillator amplifier.
Special Function Registers
A map of the on-chip memory area called the Special Func-
tion Register (SFR) space is shown in Table 1.
Note that not all of the addresses are occupied, and unoc-
cupied addresses may not be implemented on the chip.
Read accesses to these addresses will in general return
random data, and write accesses will have an indeterminate
effect.
Table 1. AT89LS53 SFR Map and Reset Values
0F8H
0F0H
B
00000000
0E8H
0E0H
ACC
00000000
0D8H
0D0H
0C8H
PSW
00000000
T2CON
00000000
T2MOD
XXXXXX00
RCAP2L
00000000
RCAP2H
00000000
0C0H
0B8H
0B0H
0A8H
0A0H
98H
90H
88H
80H
IP
XX000000
P3
11111111
IE
0X000000
P2
11111111
SCON
00000000
P1
11111111
TCON
00000000
P0
11111111
SPSR
00XXXXXX
SBUF
XXXXXXXX
TMOD
00000000
SP
00000111
TL0
00000000
DP0L
00000000
TL1
00000000
DP0H
00000000
TL2
00000000
TH0
00000000
DP1L
00000000
SPCR
000001XX
TH2
00000000
TH1
00000000
DP1H
00000000
WCON
00000010
SPDR
XXXXXXXX
0FFH
0F7H
0EFH
0E7H
0DFH
0D7H
0CFH
0C7H
0BFH
0B7H
0AFH
0A7H
9FH
97H
8FH
PCON
0XXX0000
87H
4-253

5 Page

AT89LS53-12JC arduino
Timer 0 and 1
Timer 0 and Timer 1 in the AT89LS53 operate the same
way as Timer 0 and Timer 1 in the AT89C51, AT89C52 and
AT89C55. For further information, see the October 1995
Microcontroller Data Book, page 2-45, section titled,
“Timer/Counters.”
Timer 2
Timer 2 is a 16 bit Timer/Counter that can operate as either
a timer or an event counter. The type of operation is
selected by bit C/T2 in the SFR T2CON (shown in Table 2).
Timer 2 has three operating modes: capture, auto-reload
(up or down counting), and baud rate generator. The
modes are selected by bits in T2CON, as shown in Table 8.
Timer 2 consists of two 8-bit registers, TH2 and TL2. In the
Timer function, the TL2 register is incremented every
machine cycle. Since a machine cycle consists of 12 oscil-
lator periods, the count rate is 1/12 of the oscillator fre-
quency.
In the Counter function, the register is incremented in
response to a 1-to-0 transition at its corresponding external
input pin, T2. In this function, the external input is sampled
during S5P2 of every machine cycle. When the samples
show a high in one cycle and a low in the next cycle, the
count is incremented. The new count value appears in the
register during S3P1 of the cycle following the one in which
the transition was detected. Since two machine cycles (24
oscillator periods) are required to recognize a 1-to-0 transi-
tion, the maximum count rate is 1/24 of the oscillator fre-
quency. To ensure that a given level is sampled at least
once before it changes, the level should be held for at least
one full machine cycle.
Table 8. Timer 2 Operating Modes
RCLK + TCLK CP/RL2 TR2 MODE
0 0 1 16-bit Auto-Reload
0 1 1 16-bit Capture
1
X
1
Baud Rate
Generator
X X 0 (Off)
Capture Mode
In the capture mode, two options are selected by bit
EXEN2 in T2CON. If EXEN2 = 0, Timer 2 is a 16 bit timer
or counter which upon overflow sets bit TF2 in T2CON.
This bit can then be used to generate an interrupt. If
EXEN2 = 1, Timer 2 performs the same operation, but a 1-
to-0 transition at external input T2EX also causes the cur-
rent value in TH2 and TL2 to be captured into RCAP2H and
RCAP2L, respectively. In addition, the transition at T2EX
causes bit EXF2 in T2CON to be set. The EXF2 bit, like
TF2, can generate an interrupt. The capture mode is illus-
trated in Figure 1.
Auto-Reload (Up or Down Counter)
Timer 2 can be programmed to count up or down when
configured in its 16 bit auto-reload mode. This feature is
invoked by the DCEN (Down Counter Enable) bit located in
the SFR T2MOD (see Table 9). Upon reset, the DCEN bit
is set to 0 so that timer 2 will default to count up. When
DCEN is set, Timer 2 can count up or down, depending on
the value of the T2EX pin.
Figure 1. Timer 2 in Capture Mode
OSC
T2 PIN
T2EX PIN
÷12
C/T2 = 0
C/T2 = 1
TRANSITION
DETECTOR
CONTROL
TR2
CAPTURE
CONTROL
EXEN2
TH2
TL2
TF2
OVERFLOW
RCAP2H RCAP2L
EXF2
TIMER 2
INTERRUPT
4-258 AT89LS53

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