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STC89LE53RC Datenblatt(PDF) 101 Page - STCmicro Technology Co,.Ltd

Teilenummer STC89LE53RC
Bauteilbeschribung  Enhanced 80C51 Central Processing Unit ,6T or 12T per machine cycle
PDF  165 Pages
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Hersteller  STC [STCmicro Technology Co,.Ltd]
Direct Link  http://www.stcmicro.com/
Logo STC - STCmicro Technology Co,.Ltd

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Timer 2
Interrupt
SYSclk
TF2
control
C/T2=0
C/T2=1
T2 Pin
T2EX Pin
MCU in 12T mode
MCU in 6T mode
TL2
(8 Bits)
RCAP2L
Timer 2 in Capture Mode
÷12
÷6
TR2
TH2
(8 Bits)
RCAP2H
EXF2
Transition
Detector
control
EXEN2
capture
Auto-Reload Mode
In 16-bit auto-reload mode, Timer 2 can be configured to count up or down. The counting direction is determined
by DCEN in special function register T2MOD and T2EX pin. If DCEN=0, counting up. If DCEN=1, the counting
direction is determined by T2EX pin. If T2EX=1, counting up, otherwise counting down.
The following figure shows DCEN=0, which enables Timer 2 to count up automatically. In this mode there are
two options selected by bit EXEN2 in T2CON register. If EXEN2=0, then Timer 2 counts up to 0FFFFH and sets
the TF2 (Overflow Flag) bit upon overflow. This causes the Timer 2 registers to be reloaded with the 16-bit value
in RCAP2L and RCAP2H. The values in RCAP2L and RCAP2H are preset by firmware. If EXEN2=1, then a
16-bit reload can be triggered either by an overflow or by a 1-to-0 transition at input T2EX. This transition also
sets the EXF2 bit. The Timer 2 interrupt, if enabled, can be generated when either TF2 or EXF2 are 1.
Timer 2
Interrupt
SYSclk
TF2
control
C/T2=0
C/T2=1
T2 Pin
T2EX Pin
MCU in 12T mode
MCU in 6T mode
TL2
(8 Bits)
RCAP2L
Timer 2 in Auto-Reload Mode (DCEN=0)
÷12
÷6
TR2
TH2
(8 Bits)
RCAP2H
EXF2
Transition
Detector
control
EXEN2
reload
101



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