Siemens EF 88H Series Manual de usuario descargar pdf (Pagina 125)

Device Specification

Semiconductor Group 7-63

Notes for page 62:

1) Capacitive loading on ports 0 and 2 may cause spurious noise pulses to be superimposed

on the V

of ALE and ports 1, 3, 4, 5 and 6. The noise is due to external bus capacitance

discharging into the port 0 and port 2 pins when these pins make 1-to-0 transitions during

bus operation. In the worst case (capacitive loading > 100 pF), the noise pulse on ALE line

may exceed 0.8 V. 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

on ALE and PSEN to momentarily

fall below the 0.9 V

specification when the address lines are stabilizing.

3) I

(Power down mode) is measured with:

EA = RESET = V

CC;

Port0 = Port7 = Port8 = V

; XTAL1 = N.C.; XTAL2 = V

;

PE/SWD = OWE = V

;HWDP = V

(Software Power Down mode); V

ARef

= V

;

AGND

= V

; all other pins are disconnected. Hardware Powerdown I

: OWE =V

or V

. No certain pin connection for the other pins.

4) I

(active mode) is measured with:

XTAL2 driven with t

CLCH,

CHCL

= 5 ns, V

= V

+ 0.5 V, V

= V

– 0.5 V; XTAL1 = N.C.;

EA = PE/SWD = V

; Port0 = Port7 = Port8 = V

; HWPD = V

; RESET = V

all other pins are disconnected. I

would be slightly higher if a crystal oscillator is

used (appr. 1 mA).

5) I

(Idle mode) is measured with all output pins disconnected and with all peripherals

disabled; XTAL2 driven with t

CLCH

, t

CHCL

= 5 ns, V

= V

+ 0.5 V, V

= V

– 0.5 V;

XTAL1 = N.C.; RESET = V

; HWPD = V

; Port0 = Port7 = Port8 =V

;

EA = PE/SWD = V

; all other pins are disconnected;

6) I

(slow down mode) is measured with all output pins disconnected and with all peripher-

als disabled; XTAL2 driven with t

CLCH,

CHCL

= 5 ns, V

= V

+ 0.5 V, V

– 0.5 V;

XTAL1 = N.C.;RESET= V

; HWPD = V

; Port7 = Port8 = V

; EA = PE/SWD = V

;

all other pins are disconnected;

7) I

Max at other frequencies is given by:

active mode: I

(max) = 1.50* f

OSC

+ 10

idle mode: I

(max) = 1.17* f

OSC

+ 10

where f

OSC

is the oscillator frequency in MHz. I

values are given in mA and

measured at V

= 5 V.

1 2 ... 120 121 122 123 124 125 126 127 128 129 130 ... 136 137

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Siemens EF 88H Series Manual de usuario Pagina 125

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