參數(shù)資料
型號: AT89C5115-RATUM
廠商: Atmel
文件頁數(shù): 67/113頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 16K 32VQFP
產(chǎn)品培訓模塊: MCU Product Line Introduction
標準包裝: 1,250
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 40MHz
連通性: UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 20
程序存儲器容量: 16KB(16K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量: 512 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 32-LQFP
包裝: 托盤
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
57
AT89C5115
4128G–8051–02/08
Figure 26. Timer/Counter x (x= 0 or 1) in Mode 2
Mode 3 (Two 8-bit Timers)
Mode 3 configures Timer 0 such that registers TL0 and TH0 operate as separate 8-bit
Timers (See Figure 27). 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 TMOD reg-
ister, and TR0 and TF0 in TCON register in the normal manner. TH0 is locked into a
Timer function (counting FPER /6) and takes over use of the Timer 1 interrupt (TF1) and
run control (TR1) bits. Thus, operation of Timer 1 is restricted when Timer 0 is in mode
3.
Figure 27. Timer/Counter 0 in Mode 3: Two 8-bit Counters
Timer 1
Timer 1 is identical to Timer 0 excepted for Mode 3 which is a hold-count mode. Follow-
ing comments help to understand the differences:
Timer 1 functions as either a Timer or event Counter in three modes of operation.
Figure 24 to Figure 26 show the logical configuration for modes 0, 1, and 2. Timer
1’s mode 3 is a hold-count mode.
Timer 1 is controlled by the four high-order bits of TMOD register (See Figure 38)
and bits 2, 3, 6 and 7 of TCON register (See Figure 37). TMOD register selects the
method of Timer gating (GATE1), Timer or Counter operation (C/T1#) and mode of
operation (M11 and M01). TCON register provides Timer 1 control functions:
overflow flag (TF1), run control bit (TR1), interrupt flag (IE1) and 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
FTx
CLOCK
÷
6
See section “Clock”
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
FTx
CLOCK
÷
6
FTx
CLOCK
÷
6
See section “Clock”
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