參數(shù)資料
型號(hào)： HMS99C58S
廠商： Electronic Theatre Controls, Inc.
英文描述： 8-BIT SINGLE-CHIP MICROCONTROLLERS WITH EMBEDDED FLASH
中文描述： 8位單片機(jī)與嵌入式閃存微控制器
文件頁數(shù)： 33/73頁
文件大?。?/td> 696K
代理商： HMS99C58S
HMS99C51S/52S/54S/56S/58S
Sep. 2004 Ver 1.01
29
1) Capacitive loading on ports 0 and 2 may cause spurious noise pulses to be superimposed on the V
OL
of ALE and port 3.
The noise is due to external bus capacitance discharging into the port 0 and port 2 pins when these pins make 1-to-0 tran-
sitions during bus operation. In the worst case(capacitive loading:
>
50pF at 3.3V,
>
100pF at 5V), the noise pulse on ALE
line may exceed 0.8V. In such cases it may be desirable to qualify ALE with a schmitt-trigger, or use an address latch with
a schmitt-trigger strobe input.
2) Capacitive loading on ports 0 and 2 may cause the V
OH
on ALE and PSEN to momentarily fall below the 0.9V
CC
specifica-
tion when the address lines are stabilizing.
3) I
CC
Max. at other frequencies is given by:
active mode: I
CC
= 1.27
×
f
OSC
+ 5.73
idle mode: I
CC
= 0.28
×
f
OSC
+ 1.45 (except OTP devices)
where f
OSC
is the oscillator frequency in MHz. I
CC
values are given in mA and measured at V
CC
= 5V.
4) I
CC
(active mode) is measured with:
XTAL1 driven with t
CLCH
, t
CHCL
= 5ns, V
IL
= V
SS
+ 0.5V, V
IH
= V
CC
- 0.5V; XTAL2 = N.C.;
EA = Port0 = RESET = V
CC
; all other pins are disconnected. I
CC
would be slightly higher if a crystal oscillator is used (appr.
1mA).
5) I
CC
(Idle mode) is measured with all output pins disconnected and with all peripherals disabled;
XTAL1 driven with t
CLCH
, t
CHCL
= 5ns, V
IL
= V
SS
+ 0.5V, V
IH
= V
CC
- 0.5V; XTAL2 = N.C.;
RESET = EA = V
SS
; Port0 = V
CC
; all other pins are disconnected;
6) I
PD
(Power Down Mode) is measured under following conditions:
EA = Port0 = V
CC
; RESET = V
SS
; XTAL2 = N.C.; XTAL1 = V
SS
; all other pins are disconnected.
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