參數(shù)資料
型號: ATAM893T-TKQ
廠商: Atmel
文件頁數(shù): 76/98頁
文件大小: 0K
描述: IC MON TIRE-PRESS ATARX9X SER
標準包裝: 4,000
系列: MARC4
核心處理器: MARC4
芯體尺寸: 4-位
速度: 4MHz
連通性: SSI(2 線,3 線)
外圍設(shè)備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 16
程序存儲器容量: 4KB(4K x 8)
程序存儲器類型: EEPROM
EEPROM 大?。?/td> 64 x 16
RAM 容量: 256 x 4
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 6.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 125°C
封裝/外殼: 20-SOIC(0.209",5.30mm 寬)
包裝: 帶卷 (TR)
78
4680C–4BMCU–01/05
ATAM893-D
Combination Mode 8: Manchester Demodulation/Pulse-width Demodulation
SSI mode 1:
8-bit shift register internal data input (SI) and the internal shift clock
(SCI) from the Timer 3
Timer 3 mode 10:
Manchester demodulation/pulse-width demodulation with Timer 3
For Manchester demodulation, the edge detection stage must be programmed to detect each
edge at the input. These edges are evaluated by the demodulator stage. The timer stage is used
to generate the shift clock for the SSI. A compare register 1 match event defines the correct
moment for shifting the state from the input T3I as the decoded bit into the shift register. After
that, the demodulator waits for the next edge to synchronize the timer by a reset for the next bit.
The compare register 2 can be used to detect a time error and handle it with an interrupt routine.
Before activating the demodulator mode the timer and the demodulator stage must be synchro-
nized with the bit-stream. The Manchester code timing consists of parts with the half bit-length
and the complete bit-length. A synchronization routine must start the demodulator after an inter-
val with the complete bit-length.
The counter can be driven by any internal clock source. The output T3O can be used by Timer 2
in this mode. The Manchester decoder can also be used for pulse-width demodulation. The input
must programmed to detect the positive edge. The demodulator and timer must be synchronized
with the leading edge of the pulse. After that a counter match with the compare register 1 shifts
the state at the input T3I into the shift register. The next positive edge at the input restarts the
timer.
Figure 5-57. Manchester Demodulation
10
11
1
0
1
0
11
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Synchronize
Manchester demodulation mode
Timer 3
mode
T3EX
SI
SR DATA
T3I
CM31 = SCI
1
0
011
0
Bit 0
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