P8XC557E8 datasheet(4/84 Pages) PHILIPS

4 / 84 page

1999 Mar 12

Philips Semiconductors

Product speciﬁcation

8-bit microcontroller

P8xC557E8

2.1

Electromagnetic Compatibility (EMC)

Primary attention is paid to the reduction of

electromagnetic emission of the microcontroller

P8xC557E8. The following features reduce the

electromagnetic emission and additionally improve the

electromagnetic susceptibility:

• Four digital part supply voltage pins (VDD1 to VDD4) and

four digital ground pins (VSS1 to VSS4) are placed as

pairs of VDDn and VSSn at two adjacent pins, at each side

of the package.

• Separated VDD pins for the internal logic and the port

buffers.

• Internal decoupling capacitance improves the EMC

radiation behaviour and the EMC immunity.

• External capacitors should be connected across

associated VDDn and VSSn pins (i.e. VDD1 and VSS1).

Lead length should be as short as possible. Ceramic

chip capacitors are recommended (100 nF).

2.2

Recommendation on ALE

For applications that require no external memory or

temporarily no external memory: the ALE output signal

(pulses at a frequency of 1

⁄6 × fOSC) can be disabled under

software control (bit RFI; SFR: PCON.5); if disabled, no

ALE pulse will occur. ALE pin will be pulled down

internally, switching an external address latch to a quiet

state. The MOVX instruction will still toggle ALE (external

Data Memory is accessed). ALE will retain its normal HIGH

value during Idle mode and a LOW value during

Power-down mode while in the ‘RFI reduction mode’.

Additionally during internal access (EA = 1) ALE will toggle

normally when the address exceeds the internal Program

Memory size. During external access (EA = 0) ALE will

always toggle normally, whether the flag ‘RFI’ is set or not.

ORDERING INFORMATION

Notes

1. ROMless type.

2. ROM coded type; ‘nnn’ denotes the ROM code number.

3. EPROM/OTP type.

TYPE NUMBER

PACKAGE

FREQUENCY

RANGE (MHZ)

TEMPERATURE

RANGE (

°C)

NAME

DESCRIPTION

VERSION

P80C557E8EFB(1)

QFP80

plastic quad ﬂat package;

80 leads (lead length 1.95 mm);

body 14

× 20 × 2.8 mm

SOT318-2

3.5 to 16

−40 to +85

P83C557E8EFB/nnn(2)

P87C557E8EFB(3)

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