C8051F380/1/2/3/4/5/6/7/C
TMOD
IT01CF
G
A
C
/
T T
1 1
G
A
C
/
T T
0 0
I
N
I
N
I
N
I
N
I
N
I
N
I
N
I
N
T0M
T
E
T
1
M M
1 0
T
E
T
0
M M
1 0
1
P
1
S
1
S
1
S
0
P
0
S
0
S
0
S
1
0
L
L
L
L
L
L
L
L
2
1
0
2
1
0
Pre-scaled Clock
SYSCLK
0
1
0
1
T0
Crossbar
GATE0
TR0
TCLK
TL0
(8 bits)
TF1
TR1
TF0
TR0
IE1
IT1
IE0
IT0
Interrupt
TH0
(8 bits)
Reload
INT0
IN0PL
XOR
Figure 26.2. T0 Mode 2 Block Diagram
26.1.4. Mode 3: Two 8-bit Counter/Timers (Timer 0 Only)
In Mode 3, Timer 0 is configured as two separate 8-bit counter/timers held in TL0 and TH0. The
counter/timer in TL0 is controlled using the Timer 0 control/status bits in TCON and TMOD: TR0, C/T0,
GATE0 and TF0. TL0 can use either the system clock or an external input signal as its timebase. The TH0
register is restricted to a timer function sourced by the system clock or prescaled clock. TH0 is enabled
using the Timer 1 run control bit TR1. TH0 sets the Timer 1 overflow flag TF1 on overflow and thus controls
the Timer 1 interrupt.
Timer 1 is inactive in Mode 3. When Timer 0 is operating in Mode 3, Timer 1 can be operated in Modes 0,
1 or 2, but cannot be clocked by external signals nor set the TF1 flag and generate an interrupt. However,
the Timer 1 overflow can be used to generate baud rates or overflow conditions for other peripherals.
While Timer 0 is operating in Mode 3, Timer 1 run control is handled through its mode settings. To run
Timer 1 while Timer 0 is in Mode 3, set the Timer 1 Mode as 0, 1, or 2. To disable Timer 1, configure it for
Mode 3.
268
Rev. 1.4
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