參數(shù)資料
型號: AT89LP428-20PU
廠商: Atmel
文件頁數(shù): 120/149頁
文件大?。?/td> 0K
描述: MCU 8051 4K FLASH SPI 28PDIP
產(chǎn)品培訓模塊: MCU Product Line Introduction
標準包裝: 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
外圍設備: 欠壓檢測/復位,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?。?/td> 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
72
3654A–MICRO–8/09
AT89LP428/828
Figure 13-11. Phase Correct Symmetrical (Center-Aligned) PWM
13.4.3
Multi-Phasic PWM
The PWM channels may be configured to provide multi-phasic alternating outputs by the PHS
2-0
bits in T2MOD. The AT89LP428/828 provides 1 out of 2, 1 out of 3, 1 out of 4 and 2 out of 4
phase modes (see Table 13-6). In Multi-phasic mode, the PWM outputs on CCA, CCB, CCC and
CCD are connected to a one-hot shift register that selectively enables and disables the outputs
(see Figure 13-12). Compare points on disabled channels are blocked from toggling the output
as if the compare value was set equal to TOP. The PHSD bit in T2MOD controls the direction of
the shift register. Example waveforms are shown in Figure 13-13 on page 73. In order to use
multi-phasic PWM, the associated channels must be configured for PWM operation. Non-PWM
channels are not affected by multi-phasic operation. However, their locations in the shift register
are maintained such that some periods in the PWM outputs may not have any pulses as shown
The PHS
2-0 bits may only be modified when the timer is not operational (TR2 = 0). Updates to
PHSD are allowed at any time. Note that channels C and D in 1:2 phase mode and channel D in
1:3 phase mode operate normally.
{RCAP2H,RCA2L}
CP/RL2 = 0, T2CM1-0 = 11B, DCEN = 0
Inverted
{CCxH,CCxL}
Non-Inverted
CCx
Duty Cycle Updated
Table 13-6.
Summary of Multi-Phasic Modes
PHS2-0
Mode
Behavior
PHSD = 0
PHSD = 1
000
Off
Normal Operation (all channels active at all times)
001
1:2
010
1:3
011
1:4
100
2:4
ABAB
→→→
BABA
→→→
AB
CABC
→→ →→→
CBACBA
→→→ → →
ABCDABCD
→→ → →→→ →
DCBADCBA
→ →→→ → → →
ABA
B
→→→
CDC
D
→→ →
BAB
A
→→→
DCD
C
→→ →
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