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| 型号： | RFPIC12F675K-E/SS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO20 |
| 封装： | 0.209 INCH, PLASTIC, MO-150, SSOP-20 |
| 文件页数： | 83/123页 |
| 文件大小： | 5438K |
| 代理商： | RFPIC12F675K-E/SS |
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rfPIC12F675
DS70091A-page 60
Preliminary
2003 Microchip Technology Inc.
10.3.1
MCLR
The rfPIC12F675 devices have a noise filter in the
MCLR Reset path. The filter will detect and ignore
small pulses.
It should be noted that a WDT Reset does not drive
MCLR pin low.
The behavior of the ESD protection on the MCLR pin
has been altered from previous devices of this family.
Voltages applied to the pin that exceed its specification
can result in both MCLR Resets and excessive current
beyond the device specification during the ESD event.
For this reason, Microchip recommends that the MCLR
pin no longer be tied directly to V
DD. The use of an RC
network, as shown in Figure 10-5, is suggested.
An internal MCLR option is enabled by setting the
MCLRE bit in the configuration word. When enabled,
MCLR is internally tied to V
DD. No internal pull-up
option is available for the MCLR pin.
FIGURE 10-5:
RECOMMENDED MCLR
CIRCUIT
10.3.2
POWER-ON RESET (POR)
The on-chip POR circuit holds the chip in RESET until
V
DD has reached a high enough level for proper
operation. To take advantage of the POR, simply tie the
MCLR pin through a resistor to V
DD. This will eliminate
external RC components usually needed to create
Power-on Reset. A maximum rise time for V
DD is
required. See Electrical Specifications for details (see
When the device starts normal operation (exits the
RESET condition), device operating parameters (i.e.,
voltage, frequency, temperature, etc.) must be met to
ensure operation. If these conditions are not met, the
device must be held in RESET until the operating
conditions are met.
For additional information, refer to Application Note
AN607 “Power-up Trouble Shooting”.
10.3.3
POWER-UP TIMER (PWRT)
The Power-up Timer provides a fixed 72 ms (nominal)
time-out on power-up only, from POR or Brown-out
Detect. The Power-up Timer operates on an internal
RC oscillator. The chip is kept in RESET as long as
PWRT is active. The PWRT delay allows the V
DD to
rise to an acceptable level. A configuration bit, PWRTE
can
disable
(if
set)
or
enable
(if
cleared
or
programmed) the Power-up Timer. The Power-up
Timer should always be enabled when Brown-out
Detect is enabled.
The Power-up Time delay will vary from chip to chip
and due to:
V
DD variation
Temperature variation
Process variation
See DC parameters for details (Section 13.0).
10.3.4
OSCILLATOR START-UP TIMER
(OST)
The Oscillator Start-up Timer (OST) provides a 1024
oscillator cycle (from OSC1 input) delay after the
PWRT delay is over. This ensures that the crystal
oscillator or resonator has started and stabilized.
The OST time-out is invoked only for XT, LP and HS
modes and only on Power-on Reset or wake-up from
SLEEP.
Note:
The POR circuit does not produce an
internal RESET when V
DD declines.
V
DD
PIC12F629/675
MCLR
R1
1 k
(or greater)
C1
0.1
f
(optional, not critical)
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