AT89S2051_14 Datasheet, PDF (32/46 Pages) ATMEL Corporation – 2K/4K Bytes of In-System Programmable (ISP) Flash Program Memory

33. In-System Programming (ISP) Specification
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 33-1. Memory Organization
Device #
Page Size
AT89S2051
32 bytes
AT89S4051
32 bytes
# Pages
64
128
Address Range
0000H - 07FFH
0000H - 0FFFH
Page Range
00H - 3FH
00H - 7FH
Figure 33-1. ISP Programming Device Connections
AT89S2051/S4051
2.7V to 5.5V
SCK⁽¹⁾
SERIAL IN
(MOSI)
P1.7
P1.5
V_CC
P1.6
SERIAL OUT
(MISO)
XTAL1
RST
V_CC
GND
Note: 1. SCK frequency should be less than (XTAL frequency)/8.
32 AT89S2051/S4051
3390E–MICRO–6/08