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參數(shù)資料
| 型號： | MTA85811-04I/SS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO20 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-20 |
| 文件頁數(shù)： | 11/72頁 |
| 文件大?。?/td> | 760K |
| 代理商： | MTA85811-04I/SS |
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1995 Microchip Technology Inc.
DS40115C-page 19
MTA85XXX
7.0
RESET CONDITION
A RESET can be caused by applying power to the chip
(power-up), pulling the MCLR input "low" or by a
Watchdog Timer time-out. The device will stay in
RESET as long as the Oscillator Start-Up Timer (OST)
is active or the MCLR input is "low."
The Oscillator Start-Up Timer is activated as soon as
MCLR input is sensed to be high. This implies that in
case of Power-On Reset (POR) with MCLR tied to VDD
the OST starts from power-up. In case of WDT time-
out, it will start at the end of the time-out (since MCLR
is high). In case of MCLR reset, the OST will start when
MCLR goes high. The nominal OST time-out period is
18 ms. See Section 12.0 for detailed information on
OST and Power-On Reset.
During a RESET the state of the microcontroller is
defined as:
a)
The oscillator is running or will be started
(power-up or wake-up from SLEEP).
b)
All I/O port pins (RA3:RA0 and RB7:RB0) are
put into the hi impedance state by setting the
TRIS registers to all '1's (= input mode).
c)
The Program Counter is set to all '1's.
d)
The OPTION register is set to all '1's.
e)
The Watchdog Timer
and its prescaler are
cleared.
f)
The upper-three bits (page select bits) in the
STATUS Register are cleared.
g)
RC mode only: The CLKOUT signal on the
OSC2 pin is held at a"low" level.
TABLE 7-1:
RESET CONDITION FOR REGISTERS
Register
Address
Power-on Reset
MCLR Reset during:
- normal operation
- SLEEP
WDT time-out
during normal
operation
Wake up from
SLEEP through
WDT time-out
W—
xxxx xxxx
uuuu uuuu
OPTION
—
0011 1111
INDF
00h
———
T0CKI
01h
xxxx xxxx
uuuu uuuu
PC
02h
1FFh MTA854XX
7FFh MTA858XX
1FFh MTA854XX
7FFh MTA858XX
1FFh MTA854XX
7FFh MTA858XX
STATUS
03h
0001 1xxx
000? ?uuu
uuu? ?uuu
FSR
04h
xxxx xxxx
uuuu uuuu
PORTA
05h
xxxx xxxx
uuuu uuuu
PORTB
06h
xxxx xxxx
uuuu uuuu
Legend: u = unchanged, x = unknown, reads as '0', ? = value depends on condition.
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