at89lp216-20xi ATMEL Corporation, at89lp216-20xi Datasheet - Page 28
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at89lp216-20xi
Manufacturer Part Number
at89lp216-20xi
Description
At89lp216 8-bit Microcontroller With 2k Bytes Flash
Manufacturer
ATMEL Corporation
Datasheet
1.AT89LP216-20XI.pdf
(90 pages)
- Current page: 28 of 90
- Download datasheet (3Mb)
14.2
28
Mode 1 – 16-bit Auto-Reload Timer/Counter
AT89LP216
Figure 14-1. Timer/Counter 1 Mode 0: Variable Width Counter
Mode 0 operation is the same for Timer 0 as for Timer 1, except that TR0, TF0 and INT0 replace
the corresponding Timer 1 signals in
Timer 1 (TMOD.7) and one for Timer 0 (TMOD.3). The INT0 and INT1 pins are shared with the
XTAL oscillator. They may only be used for the GATE function when using the internal RC oscil-
lator as the system clock.
In Mode 1 the Timers are configured for 16-bit auto-reload. The Timer register is run with all
16 bits. The 16-bit reload value is stored in the high and low reload registers (RH1/RL1). The
clock is applied to the combined high and low timer registers (TH1/TL1). As clock pulses are
received, the timer counts up: 0000H, 0001H, 0002H, etc. An overflow occurs on the FFFFH-to-
0000H transition, upon which the timer register is reloaded with the value from RH1/RL1 and the
overflow flag bit in TCON is set. See
gives the full 16-bit timer period compatible with the standard 8051. Mode 1 operation is the
same for Timer/Counter 0.
Figure 14-2. Timer/Counter 1 Mode 1: 16-bit Auto-Reload
INT1 Pin
T1 Pin
INT1 Pin
GATE
OSC
GATE
T1 Pin
OSC
Mode 1:
TR1
÷TPS
TR1
÷TPS
C/T = 0
C/T = 1
Time-out Period
C/T = 0
C/T =1
Control
Control
Figure
Figure
14-2. The reload registers default to 0000H, which
=
14-1. There are two different GATE bits, one for
(
---------------------------------------------------------
Oscillator Frequency
65536
(8 Bits)
(8 Bits)
(8 Bits)
TL1
RL1
TL1
–
{
RH0 RL0
(8 Bits)
(8 Bits)
RH1
TH1
(8 Bits)
TH1
,
PSC1
}
)
Reload
×
(
TF1
TPS
TF1
+
1
3621B–MICRO–11/07
)
Interrupt
Interrupt
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