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參數(shù)資料
| 型號(hào)： | MB95F263KPF-G-SNE2 |
| 廠商： | Fujitsu Semiconductor America Inc |
| 文件頁數(shù)： | 69/87頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU 8BIT 12KB FLASH 20SOP |
| 標(biāo)準(zhǔn)包裝： | 1,325 |
| 系列： | 8FX MB95260H |
| 核心處理器： | F²MC-8FX |
| 芯體尺寸： | 8-位 |
| 速度： | 16MHz |
| 連通性： | LIN，SIO，UART/USART |
| 外圍設(shè)備： | LVD，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 16 |
| 程序存儲(chǔ)器容量： | 12KB（12K x 8） |
| 程序存儲(chǔ)器類型： | 閃存 |
| RAM 容量： | 496 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.4 V ~ 5.5 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 6x8/10b |
| 振蕩器型： | 外部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 包裝： | 托盤 |
| 其它名稱： | 865-1210 |
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dsPIC30F2010
DS70118J-page 76
2011 Microchip Technology Inc.
13.1
Quadrature Encoder Interface
Logic
A typical incremental (a.k.a. optical) encoder has three
outputs: Phase A, Phase B, and an index pulse. These
signals are useful and often required in position and
speed control of ACIM and SR motors.
The two channels, Phase A (QEA) and Phase B (QEB),
have a unique relationship. If Phase A leads Phase B,
then the direction (of the motor) is deemed positive or
forward. If Phase A lags Phase B, then the direction (of
the motor) is deemed negative or reverse.
A third channel, termed index pulse, occurs once per
revolution and is used as a reference to establish an
absolute position. The index pulse coincides with
Phase A and Phase B, both low.
13.2
16-bit Up/Down Position Counter
Mode
The 16-bit Up/Down Counter counts up or down on
every count pulse, which is generated by the difference
of the Phase A and Phase B input signals. The counter
acts as an integrator, whose count value is proportional
to position. The direction of the count is determined by
the
UPDN
signal,
which
is
generated
by
the
Quadrature Encoder Interface Logic.
13.2.1
POSITION COUNTER ERROR
CHECKING
Position count error checking in the QEI is provided for
and indicated by the CNTERR bit (QEICON<15>). The
error checking only applies when the position counter
is configured for Reset on the Index Pulse modes
(QEIM<2:0> = ‘110’ or ‘100’). In these modes, the
contents of the POSCNT register is compared with the
values (0xFFFF or MAXCNT + 1, depending on direc-
tion). If these values are detected, an error condition is
generated by setting the CNTERR bit and a QEI count
error interrupt is generated. The QEI count error
interrupt can be disabled by setting the CEID bit
(DFLTCON<8>). The position counter continues to
count encoder edges after an error has been detected.
The POSCNT register continues to count up/down until
a natural rollover/underflow. No interrupt is generated
for the natural rollover/underflow event. The CNTERR
bit is a read/write bit and reset in software by the user.
13.2.2
POSITION COUNTER RESET
The Position Counter Reset Enable bit, POSRES
(QEI<2>) controls whether the position counter is reset
when the index pulse is detected. This bit is only
applicable when QEIM<2:0> = ‘100’ or ‘110’.
If the POSRES bit is set to ‘1’, then the position counter
is reset when the index pulse is detected. If the
POSRES bit is set to ‘0’, then the position counter is not
reset when the index pulse is detected. The position
counter will continue counting up or down, and will be
reset on the rollover or underflow condition.
When selecting the INDX signal to reset the position
counter (POSCNT), the user has to specify the states
on QEA and QEB input pins. These states have to be
matched in order for a reset to occur. These states are
selected by the IMV<1:0> bit in the DFLTCON <10:9>
register.
The IMV<1:0> (Index Match Value) bit allows the user
to specify the state of the QEA and QEB input pins
during an index pulse when the POSCNT register is to
be reset.
In 4X Quadrature Count Mode:
IMV1
= Required state of phase B input signal for
match on index pulse
IMV0
= Required state of phase A input signal for
match on index pulse
In 2X Quadrature Count Mode:
IMV1
= Selects phase input signal for index state
match (0 = Phase A, 1 = Phase B)
IMV0
= Required state of the selected phase input
signal for match on index pulse
The interrupt is still generated on the detection of the
index pulse and not on the position counter overflow/
underflow.
13.2.3
COUNT DIRECTION STATUS
As mentioned in the previous section, the QEI logic
generates an UPDN signal, based upon the relation-
ship between Phase A and Phase B. In addition to
the output pin, the state of this internal UPDN signal
is supplied to a SFR bit UPDN (QEICON<11>) as a
read-only bit.
Note:
QEI pins are multiplexed with analog
inputs. User must insure that all QEI asso-
ciated pins are set as digital inputs in the
ADPCFG register.
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