參數(shù)資料
型號: AT89LP428-20PU
廠商: Atmel
文件頁數(shù): 92/149頁
文件大?。?/td> 0K
描述: MCU 8051 4K FLASH SPI 28PDIP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 14
系列: 89LP
核心處理器: 8051
芯體尺寸: 8-位
速度: 20MHz
連通性: SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 30
程序存儲器容量: 4KB(4K x 8)
程序存儲器類型: 閃存
EEPROM 大小: 512 x 8
RAM 容量: 768 x 8
電壓 - 電源 (Vcc/Vdd): 2.4 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-DIP(0.300",7.62mm)
包裝: 管件
47
3654A–MICRO–8/09
AT89LP428/828
11.5
Pulse Width Modulation
On the AT89LP428/828, Timer 0 and Timer 1 may be independently configured as 8-bit asym-
metrical (edge-aligned) pulse width modulators (PWM) by setting the PWM0EN or PWM1EN
bits in TCONB, respectively. In PWM mode the generated waveform is output on the timer's
input pin, T0 or T1. Therefore, C/Tx must be set to “0” when in PWM mode and the T0 (P3.4)
and T1 (P3.5) must be configured in an output mode. The Timer Overflow Flags and Interrupts
will continue to function while in PWM mode and Timer 1 may still generate the baud rate for the
UART. The timer GATE function also works in PWM mode, allowing the output to be halted by
an external input. Each PWM channel has four modes selected by the mode bits in TMOD.
An example waveform for Timer 0 in PWM mode 0 is shown in Figure 11-5. TH0 acts as an 8-bit
counter while RH0 stores the 8-bit compare value. When TH0 is 00H the PWM output is
set high. When the TH0 count reaches the value stored in RH0 the PWM output is set low.
Therefore, the pulse width is proportional to the value in RH0. To prevent glitches, writes to
RH0 only take effect on the FFH to 00H overflow of TH0. Setting RH0 to 00H will keep the PWM
output low.
Figure 11-5. 8-bit Asymmetrical Pulse Width Modulation
Table 11-4.
TCONB
– Timer/Counter Control Register B
TCONB = 91H
Reset Value = 0010 0100B
Not Bit Addressable
PWM1EN
PWM0EN
PSC12
PSC11
PSC10
PSC02
PSC01
PSC00
Bit
7
6
543
21
0
Symbol
Function
PWM1EN
Configures Timer 1 for Pulse Width Modulation output on T1 (P3.5).
PWM0EN
Configures Timer 0 for Pulse Width Modulation output on T0 (P3.4).
PSC12-0
Prescaler for Timer 1 Mode 0. The number of active bits in TL1 equals PSC1 + 1. After reset PSC1 = 100B which
enables 5 bits of TL1 for compatibility with the 13-bit Mode 0 in AT89S2051.
PSC0
2-0
Prescaler for Timer 0 Mode 0. The number of active bits in TL0 equals PSC0 + 1. After reset PSC0 = 100B which
enables 5 bits of TL0 for compatibility with the 13-bit Mode 0 in AT89C52.
FFH
00H
RH0
(P3.4)T0
TF0 Set
TH0
Time
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