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參數(shù)資料
| 型號： | IS80C31 |
| 廠商： | Integrated Silicon Solution, Inc. |
| 英文描述： | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER |
| 中文描述： | CMOS單芯片8位微控制器 |
| 文件頁數(shù)： | 29/43頁 |
| 文件大小： | 337K |
| 代理商： | IS80C31 |
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IS80C51
IS80C31
Integrated Silicon Solution, Inc. — 1-800-379-4774
MC003-1D
11/19/98
29
ISSI
Table 9. Reset Values of the SFR's
SFR Name
PC
ACC
B
PSW
SP
DPTR
P0–P3
IP
IE
TMOD
TCON
TH0
TL0
TH1
TL1
SCON
SBUF
PCON
Reset Value
0000H
00H
00H
00H
07H
0000H
FFH
XXX00000B
0XX00000B
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 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
INST
INST
19 OSC. PERIODS
S5 S6 S1 S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6 S1 S2 S3 S4
ADDR
ADDR
ADDR
INST
ADDR
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