at89s53-33pc ATMEL Corporation, at89s53-33pc Datasheet - Page 5

• Manufacturer Part Number: at89s53-33pc
• Description: At89s53, In-system Programmable Microcontroller With 12k Bytes Flash. For New Designs Use At89s8253.
• Manufacturer: ATMEL Corporation

EA/VPP
External Access Enable. EA must be strapped to GND in
order to enable the device to fetch code from external pro-
gram memory locations starting at 0000H up to FFFFH.
Note, however, that if lock bit 1 is programmed, EA will be
internally latched on reset.
EA should be strapped to V
tions. This pin also receives the 12-volt programming
Table 1. AT89S53 SFR Map and Reset Values
0787E–MICRO–3/06
0E8H
0E0H
0D8H
0D0H
0C8H
0C0H
0B8H
0B0H
0A8H
0A0H
0F8H
0F0H
98H
90H
88H
80H
XX000000
0X000000
00000000
00000000
00000000
00000000
11111111
11111111
00000000
11111111
00000000
11111111
T2CON
SCON
TCON
PSW
ACC
P3
P2
P1
P0
IP
IE
B
XXXXXXXX
XXXXXX00
00000000
00000111
T2MOD
TMOD
SBUF
SP
CC
for internal program execu-
00XXXXXX
00000000
00000000
00000000
RCAP2L
SPSR
DP0L
TL0
00000000
00000000
00000000
RCAP2H
DP0H
TL1
enable voltage (V
volt programming is selected.
XTAL1
Input to the inverting oscillator amplifier and input to the
internal clock operating circuit.
XTAL2
Output from the inverting oscillator amplifier.
00000000
00000000
00000000
DP1L
TH0
TL2
000001XX
00000000
00000000
00000000
SPCR
DP1H
TH2
TH1
PP
) during Flash programming when 12-
XXXXXXXX
00000010
WCON
SPDR
0XXX0000
AT89S53
PCON
0FFH
0F7H
0EFH
0E7H
0DFH
0D7H
0CFH
0C7H
0BFH
0B7H
0AFH
0A7H
9FH
97H
8FH
87H
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