- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄67723 > IS89C51-12PL (INTEGRATED SILICON SOLUTION INC) 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQCC44 PDF資料下載
參數(shù)資料
| 型號(hào)： | IS89C51-12PL |
| 廠商： | INTEGRATED SILICON SOLUTION INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 25/48頁 |
| 文件大?。?/td> | 371K |
| 代理商： | IS89C51-12PL |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁當(dāng)前第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁
IS89C51
Integrated Silicon Solution, Inc. — 1-800-379-4774
31
MC016-1C
11/21/98
ISSI
Table 9. Reset Values of the SFR's
SFR Name
Reset Value
PC
0000H
ACC
00H
B
00H
PSW
00H
SP
07H
DPTR
0000H
P0-P3
FFH
IP
XXX00000B
IE
0XX00000B
TMOD
00H
TCON
00H
TH0
00H
TL0
00H
TH1
00H
TL1
00H
SCON
00H
SBUF
Indeterminate
PCON
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 is running. The CPU responds by generating an
internal reset, with the timing shown in Figure 18.
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 9 lists the SFRs and
their reset values.
Then internal RAM is not affected by reset. On power-up
the RAM content is indeterminate.
Figure 18. Reset Timing
12 OSC. PERIODS
ALE
RST
SAMPLE
RST
SAMPLE
RST
INTERNAL RESET SIGNAL
PSEN
P0
11 OSC. PERIODS
INST
ADDR
INST
19 OSC. PERIODS
S5 S6 S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6 S1 S2 S3 S4
ADDR
INST
ADDR
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| IS89C51-40PQ | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44 |
| IS89LV51-12PQ | 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP44 |
| IS89LV51-24WI | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP40 |
| IS89LV51-40W | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDIP40 |
| IS89LV52-12W | 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PDIP40 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IS89C51-12PLI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| IS89C51-12PQ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| IS89C51-12PQI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| IS89C51-12W | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| IS89C51-12WI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。