AT89S2051 Atmel Corporation, AT89S2051 Datasheet - Page 20

• Manufacturer Part Number: AT89S2051
• 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

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