AT89S2051 Atmel Corporation, AT89S2051 Datasheet - Page 20
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AT89S2051
Manufacturer Part Number
AT89S2051
Description
Manufacturer
Atmel Corporation
Specifications of AT89S2051
Flash (kbytes)
2 Kbytes
Max. Operating Frequency
24 MHz
Cpu
8051-12C
Max I/o Pins
15
Uart
1
Sram (kbytes)
0.25
Operating Voltage (vcc)
2.7 to 5.5
Timers
2
Isp
SPI
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21. Parallel Programming Specification
20
AT89S2051/S4051
Atmel’s AT89S2051/S4051 offers 2K/4K bytes of In-System Programmable Flash code memory.
In addition, the device contains a 32-byte User Signature Row and a 32-byte read-only Atmel
Signature Row.
Table 21-1.
Figure 21-1. Flash Parallel Programming Device Connections
Note:
AT89S2051
AT89S4051
Device #
1. Sampling of pin P3.1 (RDY/BSY) is optional. In Parallel Mode, P3.1 will be pulled low while the
device is busy. However, it requires an external passive pull-up to V
does not exist, so TestCode connects to P3.7, P3.5, P3.4, and P3.3.
Memory Organization
RDY/BSY
TestCode
PROG
Page Size
INC
32 bytes
32 bytes
(1)
AT89S2051/S4051
P3.1
P3.2
P3.7-3
XTAL1
GND
# Pages
128
P1.7 - P1.0
64
RST
V
CC
2.7V to 5.5V
Address Range
0000H - 07FFH
0000H - 0FFFH
DATA IN/OUT
V
PP
CC
. Also, note that P3.6
3390E–MICRO–6/08
Page Range
00H - 3FH
00H - 7FH