ST7285C datasheet(105/117 Pages) STMICROELECTRONICS

105 / 117 page

105/117

ST72E85 ST72T85

1.4 EPROM ERASURE

ST72E85 EPROM devices are erased by expo-

sure to high intensity UV light admitted through the

transparent window. This exposure discharges the

floating gate to its initial state through induced

photo current.

It is recommended that the ST72E85 devices be

kept out of direct sunlight, since the UV content of

sunlight can be sufficient to cause functional fail-

ure. Extended exposure to room level fluorescent

lighting may also cause erasure.

An opaque coating (paint, tape, label, etc...)

should be placed over the package window if the

product is to be operated under these lighting con-

ditions. Covering the window also reduces IDD in

power-saving modes due to photo-diode leakage

currents.

An Ultraviolet source of wave length 2537 Å yield-

ing a total integrated dosage of 15 Watt-sec/cm is

required to erase the ST72E85. The device will be

erased in 15 to 20 minutes if such a UV lamp with

a 12mW/cm power rating is placed 1 inch from the

device window without any interposed filters.

005Ch

005Dh

005Eh

005Fh

RDS Demodulator

RDS DE1

RDS DE2

RDS DE3

RDS DE4

see register description

0060h

0061h

0062h

0063h

0064h

0065h

0066h

0067h

0068h

0069h

006Ah

006Bh

006Ch

006Dh

006Eh

006Fh

RDS GBS

SR0 -Shift Reg 0

SR1 -Shift Reg 1

SR2 -Shift Reg 2

SR3 -Shift Reg 3

SY0 -Polynomial Reg 0

SY1 -Polynomial Reg 1

GS_CNT Count Reg

GS_INT Interrupt Reg

DR0 -RDSDAT Reg 0

DR1 -RDSDAT Reg 1

DR2 -RDSDAT Reg 2

DR3 -RDSDAT Reg 3

QR0 -QUALITY Reg 0

QR1 -QUALITY Reg 1

QR2 -QUALITY Reg 2

QR3 -QUALITY Reg 3

see register description

0070h

0071h

ADC

Data Reg

Control/Status Reg

XXh

00h

Read Only Register

Read/Write Register

0072h to

007Fh

RESERVED

0080h to

0BFFh

0C00h to

0C7Fh

RAM 3K Bytes

of which

STACK 128 Bytes

User variables and subroutine nesting

0C80h to

3FFFh

RESERVED

4000h to

FFDFh

OTP/EPROM 48K

bytes

(49120 bytes)

User application code and data

FFE0h to

FFFF h

User vectors

Interrupt and Reset Vectors

Address

Block

Reset

Status

Remarks

ST7285C Datenblatt(PDF) 105 Page - STMicroelectronics

ST7285C Datenblatt(HTML) 105 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datenblatt Download

Link URL