P87C151SA datasheet(28/33 Pages) INTEL

28 / 33 page

8XC151SASB HIGH-PERFORMANCE CHMOS MICROCONTROLLER

PROGRAMMING AND VERIFYING

NONVOLATILE MEMORY

The 87C151SASB has several areas of nonvolatile

memory that can be programmed andor verified

on-chip code memory (816 Kbytes) lock bits (3

bits) encryption array (128 bytes) and signature

bytes (3 bytes)

Figure 16 shows the setup for programming andor

verifying the nonvolatile memory Table 11 lists the

programming and verification operations and indi-

cates which operations apply to the different ver-

sions of the 87C151SASB It also specifies the sig-

nals on the programming input (PROG ) and the

ports The ROMOTPROM mode (port 0) specifies

the operation (program or verify) and the base ad-

dress of the memory area The addresses (ports 1

and 3) are relative to the base address (On-chip

memory for a 16-Kbyte ROMOTPROM device is lo-

cated at address range 0000H – 3FFFH The other

areas of the ROMOTPROM are outside the memo-

ry address space and are accessible only during pro-

gramming and verification)

Information in Figures 17 and 18 define the configu-

ration bits Figure 19 shows the waveforms for the

programming and verification cycles and Table 12

lists the timing specifications The signature bytes of

the

83C151SASB

ROM

versions

and

the

87C151SASB OTPROM versions are factory pro-

grammed Table 13 lists the addresses and the con-

tents of the signature bytes

Factory-programmed ROM and OTPROM versions

of 8XC151SASB use configuration byte information

supplied in a separate hexadecimal disk file

8XC151SASB

devices

without

internal

ROMOTPROM arrays fetch configuration byte in-

formation from external application memory based

on an internal address range of FFF98H

NOTE

The VPP source in Figure 16 must be well regu-

lated and free of glitches The voltage on the VPP

pin must not exceed the specified maximum

even under transient conditions

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