參數(shù)資料
型號(hào)： IS80LV52-40W
廠商： INTEGRATED SILICON SOLUTION INC
元件分類： 微控制器/微處理器
英文描述： CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER
中文描述： 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PDIP40
封裝： 0.600 INCH, PLASTIC, DIP-40
文件頁(yè)數(shù)： 33/48頁(yè)
文件大?。?/td> 408K
代理商： IS80LV52-40W
IS80LV52
IS80LV32
Integrated Silicon Solution, Inc. — 1-800-379-4774
ADVANCE INFORMATION
MC019-0A
10/01/98
33
ISSI
Table 11. Reset Values of the SFR's
SFR Name
PC
ACC
B
PSW
SP
DPTR
P0-P3
IP
IE
TMOD
TCON
T2CON
TH0
TL0
TH1
TL1
TH2
TL2
RCAP2H
RCAP2L
SCON
SBUF
PCON
Reset Value
0000H
00H
00H
00H
07H
0000H
FFH
XX000000B
0X000000B
00H
00H
00H
00H
00H
00H
00H
00H
00H
00H
00H
00H
Indeterminate
0XXX0000B
OTHER INFORMATION
Reset
The reset input is the RST pin, which is the input to a
Schmitt Trigger.
A reset is accomplished by holding the RST pin high for at
least two machine cycles (24 oscillator periods), while the
oscillator s running The CPU responds by generating an
internal reset, with the timing shown in Figure 21.
The external reset signal is asynchronous to the internal
clock. The RST pin is sampled during State 5 Phase 2 of
every machine cycle. The port pins will maintain their
current activities for 19 oscillator periods after a logic 1
has been sampled at the RST pin; that is, for 19 to 31
oscillator periods after the external reset signal has been
applied to the RST pin.
The internal reset algorithm writes 0s to all the SFRs
except the port latches, the Stack Pointer, and SBUF. The
port latches are initialized to FFH, the Stack Pointer to
07H, and SBUF is indeterminate. Table 11 lists the SFRs
and their reset values.
Then internal RAM is not affected by reset. On power-up
the RAM content is indeterminate.
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