AT89C52-20QC Atmel, AT89C52-20QC Datasheet - Page 15

• Manufacturer Part Number: AT89C52-20QC
• Description: Microcontrollers (MCU) Microcontroller
• Manufacturer: Atmel

Specifications of AT89C52-20QC

• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 8 KB
• Data Ram Size: 256 B
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Package / Case: PQFP-44
• Minimum Operating Temperature: 0 C
• Lead Free Status / Rohs Status: No

Figure 9. Programming the Flash Memory
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
3-24 MHz
PP
AVGL
GHAX
DVGL
GHDX
EHSH
SHGL
GHSL
GLGH
AVQV
ELQV
EHQZ
GHBL
WC
PROGRAMMING
MODES TABLE
PP
= 0°C to 70°C, V
CLCL
(1)
SEE FLASH
(1)
OOOOH/1FFFH
(1)
1. Only used in 12-volt programming mode.
ADDR.
A0 - A7
A8 - A12
CC
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
= 5.0 10%
PP
PP
Setup to PROG Low
Hold after PROG
P1
P2.0 - P2.4
P2.6
P2.7
P3.6
P3.7
XTAL2
XTAL1
GND
AT87F52
PSEN
RST
ALE
V
EA
P0
CC
PP
+5V
PGM
DATA
PROG
V /V
V
IH
IH
PP
Figure 10. Verifying the Flash Memory
3-24 MHz
PROGRAMMING
MODES TABLE
OOOOH/1FFFH
SEE FLASH
ADDR.
48t
48t
48t
48t
48t
11.5
Min
A0 - A7
A8 - A12
10
10
3
1
0
CLCL
CLCL
CLCL
CLCL
CLCL
P1
P2.0 - P2.4
P2.6
P2.7
P3.6
P3.7
XTAL 2
XTAL1
GND
AT87F52
48t
48t
48t
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
µs
µs
µs
µs
V
V
V
IH
IH
15