参数资料
型号: AT89EB5114
厂商: Atmel Corp.
元件分类: 8位微控制器
英文描述: Low-pin-count 8-bit microcontroller with A/D converter
中文描述: 低引脚数的8 - A / D转换位微控制器
文件页数: 26/95页
文件大小: 1126K
代理商: AT89EB5114
26
4311A–8051–01/05
Figure 9.
Timer/Counter x (x = 0 or 1) in Mode 2
F
CkIdle
Mode 3 (Two 8-bit Timers)
Mode 3 configures Timer 0 so that registers TL0 and TH0 operate as 8-bit Timers (see
Figure 10). This mode is provided for applications requiring an additional 8-bit Timer or
Counter. TL0 uses the Timer 0 control bits C/T0# and GATE0 in the TMOD register, and
TR0 and TF0 in the TCON register in the normal manner. TH0 is locked into a Timer
function (counting F
UART
) and takes over use of the Timer 1 interrupt (TF1) and run con-
trol (TR1) bits. Thus, operation of Timer 1 is restricted when Timer 0 is in mode 3.
Figure 10.
Timer/Counter 0 in Mode 3: Two 8-bit Counters
Timer 1
Timer 1 is identical to Timer 0 except for Mode 3 which is a hold-count mode. The fol-
lowing comments help to understand the differences:
Timer 1 functions as either a Timer or an event Counter in the three operating
modes. Figure 7 to Figure 9 show the logical configuration for modes 0, 1, and 2.
Mode 3 of Timer 1 is a hold-count mode.
Timer 1 is controlled by the four high-order bits of the TMOD register (see Figure 16)
and bits 2, 3, 6 and 7 of the TCON register (see Figure 15). The TMOD register
selects the method of Timer gating (GATE1), Timer or Counter operation (C/T1#)
and the operating mode (M11 and M01). The TCON register provides Timer 1
control functions: overflow flag (TF1), run control bit (TR1), interrupt flag (IE1) and
the interrupt type control bit (IT1).
Timer 1 can serve as the Baud Rate Generator for the Serial Port. Mode 2 is best
suited for this purpose.
TRx
TCON reg
TFx
TCON reg
0
1
GATEx
TMOD reg
Overflow
Timer x
Interrupt
Request
C/Tx#
TMOD reg
TLx
(8 bits)
THx
(8 bits)
INTx#
Tx
/ 6
TR0
TCON.4
TF0
TCON.5
INT0#
0
1
GATE0
TMOD.3
Overflow
Timer 0
Interrupt
Request
C/T0#
TMOD.2
TL0
(8 bits)
TR1
TCON.6
TH0
(8 bits)
TF1
TCON.7
Overflow
Timer 1
Interrupt
Request
T0
F
CkIdle
F
CkIdle
/ 6
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