P83C366 datasheet(70/92 Pages) PHILIPS

70 / 92 page

1999 Mar 10

Philips Semiconductors

Product speciﬁcation

Microcontrollers for PAL/SECAM TV

with OSD and VST

P8xCx66 family

18 EPROM PROGRAMMER

18.1

Interface to the on-chip EPROMs

The P87C766 contains two EPROMs: the program

EPROM and the OSD EPROM. The EPROM memory map

is shown in Fig.46.

The 64K

× 8-bit program EPROM is subdivided into four

EPROM modules: Modules 1 to 4, each of 16 kbytes.

The 8K

× 8-bit OSD EPROM is subdivided into two

modules: OSDL and OSDH, each of 4 kbytes. The OSDL

module provides the 8 LSBs of the 12-bit character word

and the OSDH module provides the 4 MSBs of the 12-bit

character word. The 4 MSBs of OSDH are not used and

should be programmed to logic 1s.

To ensure greater reliability and to reduce power

consumption, all unused EPROM cells should be

programmed to logic 1s.

To program the EPROM modules, several functions of the

EPROMs must be mapped to the pins of the package.

• The program EPROM uses 16 address lines: A0 to A15

– A0 to A13 are used for the EPROM address

– A14 and A15 are used to select one of the 4 program

EPROM modules; see Table 82.

• The OSD EPROM uses 13 address lines A0 to A12

– A0 to A11 are used for the EPROM address

– A12 is used to select one of the 2 OSD EPROM

modules; see Table 83.

• Data I/O: D0 to D7 are used for all EPROM modules

• Write Enable (WE): active LOW programming pulse

• Output Enable (OE): active LOW data output enable,

when in EPROM verify mode, OE must be LOW

• Programming voltage: the programming and verification

voltage (VPP) is typically 12.75 V; when programming

and verify operations have been completed VPP should

be reduced to 0 V.

All other signals to be connected to the EPROM module in

the programming/verification mode are generated

internally. Table 84 gives an overview of the functions

mapped to the pins.

Programming and verification waveform characteristics

are specified in Chapter 21.

Table 82 Selection of Program EPROM modules

Table 83 Selection of OSD EPROM modules

A15

A14

PROGRAM EPROM MODULE

Module 1

Module 2

Module 3

Module 4

A12

OSD EPROM MODULE

OSDL module

OSDH module

Table 84 Truth table for EPROM modules

OPERATION MODE

VPP

I/O

ADDRESS LINES

Programming Program EPROM

12.75

data in

A0 to A15

Veriﬁcation Program EPROM

12.75

data out

A0 to A15

Programming OSD EPROM

12.75

data in

A0 to A12

Veriﬁcation OSD EPROM

12.75

data out

A0 to A12

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