參數(shù)資料
型號(hào)： PIC16LCR620AT-04I/SO
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 4 MHz, RISC MICROCONTROLLER, PDSO18
封裝： 0.300 INCH, PLASTIC, MS-013, SO-18
文件頁(yè)數(shù)： 78/128頁(yè)
文件大?。?/td> 3677K
代理商： PIC16LCR620AT-04I/SO
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2003 Microchip Technology Inc.
DS30235J-page 51
PIC16C62X
9.4.5
TIME-OUT SEQUENCE
On power-up the time-out sequence is as follows: First
PWRT time-out is invoked after POR has expired. Then
OST is activated. The total time-out will vary based on
oscillator configuration and PWRTE bit status. For
example, in RC mode with PWRTE bit erased (PWRT
disabled), there will be no time-out at all. Figure 9-8,
Figure 9-9 and Figure 9-10 depict time-out sequences.
Since the time-outs occur from the POR pulse, if MCLR
is kept low long enough, the time-outs will expire. Then
bringing MCLR high will begin execution immediately
(see Figure 9-9). This is useful for testing purposes or
to synchronize more than one PIC16C62X device
operating in parallel.
Table 9-4 shows the RESET conditions for some
special registers, while Table 9-5 shows the RESET
conditions for all the registers.
9.4.6
POWER CONTROL (PCON)/
STATUS REGISTER
The power control/STATUS register, PCON (address
8Eh), has two bits.
Bit0 is BOR (Brown-out). BOR is unknown on Power-
on Reset. It must then be set by the user and checked
on subsequent RESETS to see if BOR = 0, indicating
that a brown-out has occurred. The BOR STATUS bit is
a don’t care and is not necessarily predictable if the
brown-out circuit is disabled (by setting BODEN bit = 0
in the Configuration word).
Bit1 is POR (Power-on Reset). It is a ‘0’ on Power-on
Reset and unaffected otherwise. The user must write a
‘1’ to this bit following a Power-on Reset. On a
subsequent RESET, if POR is ‘0’, it will indicate that a
Power-on Reset must have occurred (V
DD may have
gone too low).
TABLE 9-1:
TIME-OUT IN VARIOUS SITUATIONS
TABLE 9-2:
STATUS/PCON BITS AND THEIR SIGNIFICANCE
Legend: u = unchanged, x = unknown
Oscillator Configuration
Power-up
Brown-out Reset
Wake-up
from SLEEP
PWRTE = 0
PWRTE = 1
XT, HS, LP
72 ms + 1024 T
OSC
1024 T
OSC
72 ms + 1024 T
OSC
1024 T
OSC
RC
72 ms
—
72 ms
—
POR
BOR
TO
PD
0X11
Power-on Reset
0X0X
Illegal, TO is set on POR
0XX0
Illegal, PD is set on POR
10XX
Brown-out Reset
110u
WDT Reset
1100
WDT Wake-up
11uu
MCLR Reset during normal operation
1110
MCLR Reset during SLEEP
TABLE 9-3:
SUMMARY OF REGISTERS ASSOCIATED WITH BROWN-OUT
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR Reset
Value on all
other
RESETS(1)
83h
STATUS
TO
PD
0001 1xxx
000q quuu
8Eh
PCON
—
—POR
BOR
---- --0x
---- --uq
Legend: u = unchanged, x = unknown, - = unimplemented bit, reads as ‘0’, q = value depends on condition.
Note 1: Other (non Power-up) Resets include MCLR Reset, Brown-out Reset and Watchdog Timer Reset during
normal operation.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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PIC16LF1454-E/P 制造商:Microchip Technology Inc 功能描述:7 KB FLASH, 512 BYTES RAM, 48 MHZ INT. OSC, 12 I/0, ENHANCED - Rail/Tube 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 7KB FLASH 14PDIP
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PIC16LF1454-E/ST 制造商:Microchip Technology Inc 功能描述:7 KB FLASH, 512 BYTES RAM, 48 MHZ INT. OSC, 12 I/0, ENHANCED - Rail/Tube 制造商:Microchip Technology Inc 功能描述:IC MCU 8BIT 7KB FLASH 14TSSOP
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