參數(shù)資料
型號(hào)： PIC16C54C-04I/SO
廠商： Microchip Technology
文件頁(yè)數(shù)： 77/194頁(yè)
文件大?。?/td> 0K
描述： IC MCU OTP 512X12 18SOIC
產(chǎn)品培訓(xùn)模塊： Asynchronous Stimulus
標(biāo)準(zhǔn)包裝： 42
系列： PIC® 16C
核心處理器： PIC
芯體尺寸： 8-位
速度： 4MHz
外圍設(shè)備： POR，WDT
輸入/輸出數(shù)： 12
程序存儲(chǔ)器容量： 768B（512 x 12）
程序存儲(chǔ)器類型： OTP
RAM 容量： 25 x 8
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 5.5 V
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 18-SOIC（0.295"，7.50mm 寬）
包裝： 管件
配用： XLT18SO-1-ND - SOCKET TRANSITION 18SOIC 300MIL
309-1075-ND - ADAPTER 18-SOIC TO 18-SOIC
309-1011-ND - ADAPTER 18-SOIC TO 18-DIP
309-1010-ND - ADAPTER 18-SOIC TO 18-DIP
AC164002-ND - MODULE SKT PROMATEII 18/28SOIC
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PIC18F2450/4450
DS39760A-page 166
Advance Information
2006 Microchip Technology Inc.
15.2.4
AUTO-WAKE-UP ON SYNC BREAK
CHARACTER
During Sleep mode, all clocks to the EUSART are
suspended. Therefore, the Baud Rate Generator is
inactive
and
proper
byte
reception
cannot
be
performed. The auto-wake-up feature allows the
controller to wake-up due to activity on the RX/DT line
while the EUSART is operating in Asynchronous mode.
The auto-wake-up feature is enabled by setting the
WUE bit (BAUDCON<1>). Once set, the typical receive
sequence on RX/DT is disabled and the EUSART
remains in an Idle state, monitoring for a wake-up event
independent of the CPU mode. A wake-up event
consists of a high-to-low transition on the RX/DT line.
(This coincides with the start of a Sync Break or a
Wake-up Signal character for the LIN protocol.)
Following a wake-up event, the module generates an
RCIF
interrupt.
The
interrupt
is
generated
synchronously to the Q clocks in normal operating
modes (Figure 15-8) and asynchronously if the device
is in Sleep mode (Figure 15-9). The interrupt condition
is cleared by reading the RCREG register.
The WUE bit is automatically cleared once a low-to-high
transition is observed on the RX line following the wake-
up event. At this point, the EUSART module is in Idle
mode and returns to normal operation. This signals to
the user that the Sync Break event is over.
15.2.4.1
Special Considerations Using
Auto-Wake-up
Since auto-wake-up functions by sensing rising edge
transitions on RX/DT, information with any state
changes before the Stop bit may signal a false End-of-
Character and cause data or framing errors. To work
properly,
therefore,
the
initial
character
in
the
transmission must be all ‘0’s. This can be 00h (8 bytes)
for standard RS-232 devices or 000h (12 bits) for LIN
bus.
Oscillator start-up time must also be considered,
especially in applications using oscillators with longer
start-up intervals (i.e., XT or HS mode). The Sync
Break (or Wake-up Signal) character must be of
sufficient length and be followed by a sufficient interval
to allow enough time for the selected oscillator to start
and provide proper initialization of the EUSART.
15.2.4.2
Special Considerations Using
the WUE Bit
The timing of WUE and RCIF events may cause some
confusion when it comes to determining the validity of
received data. As noted, setting the WUE bit places the
EUSART in an Idle mode. The wake-up event causes
a receive interrupt by setting the RCIF bit. The WUE bit
is cleared after this when a rising edge is seen on RX/
DT. The interrupt condition is then cleared by reading
the RCREG register. Ordinarily, the data in RCREG will
be dummy data and should be discarded.
The fact that the WUE bit has been cleared (or is still
set) and the RCIF flag is set should not be used as an
indicator of the integrity of the data in RCREG. Users
should consider implementing a parallel method in
firmware to verify received data integrity.
To assure that no actual data is lost, check the RCIDL
bit to verify that a receive operation is not in process. If
a receive operation is not occurring, the WUE bit may
then be set just prior to entering the Sleep mode.
FIGURE 15-8:
AUTO-WAKE-UP BIT (WUE) TIMINGS DURING NORMAL OPERATION
FIGURE 15-9:
AUTO-WAKE-UP BIT (WUE) TIMINGS DURING SLEEP
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
OSC1
WUE bit(1)
RX/DT Line
RCIF
Note 1: The EUSART remains in Idle while the WUE bit is set.
Bit set by user
Auto-Cleared
Cleared due to user read of RCREG
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
Q1
Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
OSC1
WUE bit(2)
RX/DT Line
RCIF
Sleep Command Executed
Note 1:
If the wake-up event requires long oscillator warm-up time, the auto-clear of the WUE bit can occur while the
stposc signal is still active.
This sequence should not depend on the presence of Q clocks.
2:
The EUSART remains in Idle while the WUE bit is set.
Sleep Ends
Auto-Cleared
Note 1
Cleared due to user read of RCREG
Bit set by user
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