参数资料
型号: AT83EB5114XXXTGRIL
厂商: ATMEL CORP
元件分类: 微控制器/微处理器
英文描述: Low-pin-count 8-bit microcontroller with A/D converter
中文描述: 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PDSO20
封装: SO-20
文件页数: 25/95页
文件大小: 1126K
代理商: AT83EB5114XXXTGRIL
25
4311A–8051–01/05
operation.
Timer 0 overflow (count rolls over from all 1s to all 0s) sets the TF0 flag and generates
an interrupt request.
It is important to stop the Timer/Counter before changing modes.
Mode 0 (13-bit Timer)
Mode 0 configures Timer 0 as a 13-bit Timer which is set up as an 8-bit Timer (TH0 reg-
ister) with a modulo-32 prescaler implemented with the lower five bits of the TL0 register
(see Figure 7). The upper three bits of the TL0 register are indeterminate and should be
ignored. Prescaler overflow increments the TH0 register.
Figure 7.
Timer/Counter x (x= 0 or 1) in Mode 0
F
CkIdle
Mode 1 (16-bit Timer)
Mode 1 configures Timer 0 as a 16-bit Timer with the TH0 and TL0 registers connected
in a cascade (see Figure 8). The selected input increments the TL0 register.
Figure 8.
Timer/Counter x (x = 0 or 1) in Mode 1
F
CkIdle
Mode 2 (8-bit Timer with Auto-
Reload)
Mode 2 configures Timer 0 as an 8-bit Timer (TL0 register) that automatically reloads
from the TH0 register on overflow (see Figure 9). TL0 overflow sets the TF0 flag in the
TCON register and reloads TL0 with the contents of TH0, which is preset by the soft-
ware. When the interrupt request is serviced, the hardware clears TF0. The reload
leaves TH0 unchanged. The next reload value may be changed at any time by writing it
to the TH0 register.
TRx
TCON reg
TFx
TCON reg
0
1
GATEx
TMOD reg
Overflow
Timer x
Interrupt
Request
C/Tx#
TMOD reg
TLx
(5 bits)
THx
(8 bits)
INTx#
Tx
/ 6
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
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