AT87251G2D_14 Datasheet, PDF (44/77 Pages) ATMEL Corporation – Registers Accessible as Bytes, Words or Dwords

• Then device is driving the data on Port 2.
• It is possible to alternate programming and verification operation (see Paragraph
Programming Algorithm). Please make sure the voltage on the EA# pin has actually
been lowered to V_DD before performing the verifying operation.
• PSEN# and the other control signals have to be released to complete a sequence of
verifying operations or a sequence of programming and verifying operations.
Table 37. Verifying Modes
ROM Area⁽¹⁾
RST EA#/VPP PSEN# ALE/PROG# P0 P2 P1(MSB) P3(LSB)
On-chip code
memory
1
1
0
16-bit Address
1
28h Data 0000h-7FFFh (32
kilobytes)
Configuration Bytes
1
1
0
1
29h
Data
CONFIG0: FFF8h
CONFIG1: FFF9h
Lock Bits
1
1
0
1
2Bh Data 0000h
Signature Bytes
1
1
0
1
29h
Data
0030h, 0031h, 0060h,
0061h
Notes: 1. To preserve the secrecy of on-chip code memory when encrypted, the Encryption
Array can not be verified.
Figure 7. Setup for Verifying
VDD
VDD
Mode
RST
EA#/VPP
ALE/PROG#
PSEN#
VDD
TSC8x251G2D
P0[7:0]
P2[7:0]
Data
A[7:0]
A[14:8]
P3[7:0]
P1[7:0]
XTAL1
VSS/VSS1/VSS2
4 to 12 MHz
44 AT/TSC8x251G2D
4135F–8051–11/06