參數(shù)資料
型號： PIC16C621-20/SS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 20 MHz, RISC MICROCONTROLLER, PDSO20
封裝： 0.209 INCH, PLASTIC, MO-150, SSOP-20
文件頁數(shù)： 69/121頁
文件大小： 1202K
代理商： PIC16C621-20/SS
1999 Microchip Technology Inc.
DS30235H-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 9-9,
Figure 9-10
and
Figure 9-11
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 9-10). This is useful for testing purposes or
to synchronize more than one PIC16C62X
device
operating in parallel.
Table 9-6 shows the reset conditions for some special
registers, while Table 9-7 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 (VDD may have
gone too low).
TABLE 9-3:
TIME-OUT IN VARIOUS SITUATIONS
TABLE 9-4:
STATUS/PCON BITS AND THEIR SIGNIFICANCE
Legend: u = unchanged, x = unknown
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.
Oscillator Configuration
Power-up
Brown-out Reset
Wake-up
from SLEEP
PWRTE = 0
PWRTE = 1
XT, HS, LP
72 ms + 1024 TOSC
1024 TOSC
72 ms + 1024 TOSC
1024 TOSC
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 9-5:
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
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PIC16C621A-04/SS 功能描述:8位微控制器 -MCU 1.75KB 96 RAM 13 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
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