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TSC87C52-20IAD Arkusz danych(PDF) 9 Page - TEMIC Semiconductors

Numer części TSC87C52-20IAD
Szczegółowy opis  CMOS 0 to 33 MHz Programmable 8-bit Microcontroller
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Producent  TEMIC [TEMIC Semiconductors]
Strona internetowa  http://www.temic.de
Logo TEMIC - TEMIC Semiconductors

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TSC87C52
9
MATRA MHS
Rev. C – 10 Sept 1997
Preliminary
Description
Symbol
REN
Serial Reception Enable bit
Set to enable serial reception.
Clear to disable serial reception.
TB8
Ninth bit to transmit in mode 2 and 3
Set to transmit a logic 1 in the 9th bit.
Clear to transmit a logic 0 in the 9th bit.
RB8
Ninth bit received in mode 2 and 3
Set by hardware if 9th bit received is logic 1.
Clear by hardware if 9th bit received is logic 0.
TI
Transmit Interrupt Flag
Set by hardware at the end of the 8th bit time in mode 0 or at the beginning of the stop bit in the other
modes.
Clear to acknowledge interrupt.
RI
Receive Interrupt Flag
Set by hardware at the end of the 8th bit time in mode 0, see Figure 4 and Figure 5 in the other modes.
Clear to acknowledge interrupt.
The reset value of SCON is 0000 0000b.
Timer 2
The Timer 2 in the TSC87C52 operates identically to the Timer 2 in the 80C52 but includes the following
enhancements. For a complete understanding of the TSC87C52 Timer 2 please refer to the description in the 80C51
Hardware Description Guide.
Auto–reload (up or down counter)
Enhanced Timer 2 can now be programmed to count up or down when configured in its 16–bit auto–reload mode. This
feature is controlled by the DCEN (Down Counter Enable) bit. DCEN is located in T2MOD at bit location 0 (see
Table 5). Setting the DCEN bit enables Timer 2 to count up or down as shown in Figure 6. In this mode the T2EX pin
controls the direction of count.
A logic 1 at T2EX makes Timer 2 count up. The timer will overflow at FFFFh and set the TF2 bit. This overflow also
causes the 16–bit value in RCAP2H and RCAP2L to be reloaded into the timer registers, TH2 and TL2, respectively.
A logic 0 at T2EX makes Timer 2 count down. Now the timer underflows when TH2 and TL2 equal the values stored
in RCAP2H and RCAP2L. The underflow sets the TF2 bit and causes FFFFh to be reloaded into the timer registers.
The EXF2 bit toggles whenever Timer 2 overflows or underflows. In this operating mode, EXF2 does not flag an
interrupt.
COUNT DIRECTION
1= UP
0= DOWN
(DOWN COUNTING RELOAD VALUE)
C/T2
TF2
TR2
÷ 12
OSC
T2
T2EX
EXF2
TH2
(8–bit)
TL2
(8–bit)
RCAP2H
(8–bit)
RCAP2L
(8–bit)
FFh
(8–bit)
FFh
(8–bit)
TOGGLE
(UP COUNTING RELOAD VALUE)
TIMER 2
INTERRUPT
Figure 6 Timer 2 Auto–Reload Mode Up/Down Counter


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