AT89 ATMEL Corporation, AT89 Datasheet - Page 7

• Manufacturer Part Number: AT89
• Description: 8-Bit Microcontroller with 4K Bytes Flash
• Manufacturer: ATMEL Corporation

Figure 3. Programming the Flash
Flash Programming and Verification Characteristics
T
Note:
Symbol
V
I
1/t
t
t
t
t
t
t
t
t
t
t
t
t
t
A
PROGRAMMING
PP
AVGL
GHAX
DVGL
GHDX
EHSH
SHGL
GHSL
GLGH
AVQV
ELQV
EHQZ
GHBL
WC
MODES ABLE
3-24 MHz
PP
= 0°C to 70°C, V
SEE FLASH
CLCL
(1)
(1)
OOOOH/OFFFH
(1)
1. Only used in 12-volt programming mode.
ADDR.
T
A0 - A7
A8 - A11
Parameter
Programming Enable Voltage
Programming Enable Current
Oscillator Frequency
Address Setup to PROG Low
Address Hold After PROG
Data Setup to PROG Low
Data Hold After PROG
P2.7 (ENABLE) High to V
V
V
PROG Width
Address to Data Valid
ENABLE Low to Data Valid
Data Float After ENABLE
PROG High to BUSY Low
Byte Write Cycle Time
CC
PP
PP
= 5.0
Setup to PROG Low
Hold After PROG
P1
P2.0 - P2.3
P2.6
P2.7
P3.6
P3.7
XTAL2
XTAL1
GND
10%
AT89C51
PSEN
RST
ALE
V
EA
P0
CC
PP
+5V
PGM
DATA
PROG
V /V
V
IH
IH
PP
Figure 4. Verifying the Flash
3-24 MHz
PROGRAMMING
MODES ABLE
SEE FLASH
OOOOH/0FFFH
ADDR.
48t
48t
48t
48t
48t
T
11.5
Min
10
10
CLCL
CLCL
CLCL
CLCL
CLCL
3
1
0
A0 - A7
A8 - A11
P1
P2.0 - P2.3
P2.6
P2.7
P3.6
P3.7
XTAL2
XTAL1
GND
48t
48t
48t
AT89C51
Max
12.5
110
1.0
1.0
2.0
24
CLCL
CLCL
CLCL
PSEN
RST
ALE
V
EA
P0
CC
+5V
PGM DATA
(USE 10K
PULLUPS)
Units
MHz
mA
ms
V
s
s
s
s
V
V
IH
IH
4-35