參數(shù)資料
型號： MC68HC711D3CP3
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP40
封裝： PLASTIC, DIP-40
文件頁數(shù)： 127/138頁
文件大?。?/td> 1047K
代理商： MC68HC711D3CP3
Input Capture
MC68HC711D3 Data Sheet, Rev. 2.1
Freescale Semiconductor
89
8.3.1 Timer Control 2 Register
Use the control bits of timer control 2 register (TCTL2) to program input capture functions to detect a
particular edge polarity on the corresponding timer input pin. Each of the input capture functions can be
independently configured to detect rising edges only, falling edges only, any edge (rising or falling), or to
disable the input capture function. The input capture functions operate independently of each other and
can capture the same TCNT value if the input edges are detected within the same timer count cycle.
EDGxB and EDGxA — Input Capture Edge Control
There are four pairs of these bits. Each pair is cleared to 0 by reset and must be encoded to configure
the corresponding input capture edge detector circuit. IC4 functions only if the I4/O5 bit in PACTL is
set. Refer to Table 8-2 for timer control configuration.
8.3.2 Timer Input Capture Registers
When an edge has been detected and synchronized, the 16-bit free-running counter value is transferred
into the input capture register pair as a single 16-bit parallel transfer. Timer counter value captures and
timer counter incrementing occur on opposite half-cycles of the phase two clock so that the count value
is stable whenever a capture occurs. The timer input capture (TICx) registers are not affected by reset.
Input capture values can be read from a pair of 8-bit read-only registers. A read of the high-order byte of
an input capture register pair inhibits a new capture transfer for one bus cycle. If a double-byte read
instruction, such as LDD, is used to read the captured value, coherency is assured. When a new input
capture occurs immediately after a high-order byte read, transfer is delayed for an additional cycle but the
value is not lost.
Address:
$0021
Bit 7
654321
Bit 0
Read:
EDG4B
EDG4A
EDG1B
EDG1A
EDG2B
EDG2A
EDG3B
EDG3A
Write:
Reset:
00000000
Figure 8-3. Timer Control 2 Register (TCTL2)
Table 8-2. Timer Control Configuration
EDGxB
EDGxA
Configuration
0
Capture disabled
0
1
Capture on rising edges only
1
0
Capture on falling edges only
1
Capture on any edge
Address: $0010 — TIC1 (High)
Bit 15
14
13
12
11
10
9
Bit 8
Read:
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Write:
Reset:
Unaffected by reset
= Unimplemented
Figure 8-4. Timer Input Capture Registers (TICx)
相關(guān)PDF資料
PDF描述
MC68HC11D3CFN3 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQCC44
MC68HC11D3CFB1 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQFP44
MC68L11D0CFB3 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQFP44
MC68HC11D0CFN2R2 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC44
MC68HC11D3CP1 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDIP40
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