AT87F55WD-24AI Atmel, AT87F55WD-24AI Datasheet - Page 16

• Manufacturer Part Number: AT87F55WD-24AI
• Description: IC MICRO CTRL 24MHZ 44PLCC
• Manufacturer: Atmel
• Series: 87Fr

Specifications of AT87F55WD-24AI

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 24MHz
• Connectivity: UART/USART
• Peripherals: WDT
• Number Of I /o: 32
• Program Memory Size: 20KB (20K x 8)
• Program Memory Type: OTP Quick FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Other names: AT87F55WD24AI

Programming Interface
Every code byte in the QuickFlash array can be pro-
grammed by using the appropriate combination of control
signals. The write operation cycle is self-timed and once
initiated, will automatically time itself to completion.
Table 9. QuickFlash Programming Modes
Notes:
Figure 13. Programming the QuickFlash Memory
*Programming address line A14 (P3.4) is not the same as the external memory address line A14 (P2.6).
16
Mode
Write Code Data
Read Code Data
Write Lock Bit 1
Write Lock Bit 2
Write Lock Bit 3
Read Lock Bits
1, 2, 3
Read Atmel ID
Read Device ID
Read Device ID
3-33 MHz
PROGRAMMING
MODES TABLE
SEE FLASH
0000H/4FFFH
1. Each Prog pulse is 200 ns for Write Code Data and 100
2. RDY/BSY signal is output on P3.0 during programming.
ADDR.
A14*
A0 - A7
V
6.5V
6.5V
6.5V
A8 - A13
5V
5V
5V
5V
5V
5V
CC
AT87F55WD
RST
H
H
H
H
H
H
H
H
H
P1.0-P1.7
P2.0 - P2.5
P2.6
P2.7
P3.3
P3.6
P3.7
XTAL2
XTAL1
GND
P3.4
AT87F55WD
PSEN
L
L
L
L
L
L
L
L
L
PSEN
P3.0
RST
ALE
PROG
V
ALE/
EA
P0
CC
H
H
H
H
H
+5V
H/12V
EA/
V
12V
12V
12V
12V
H
H
H
H
PP
PGM
DATA
PROG
V /V
V
RDY/
BSY
IH
IH
PP
P2.6
H
H
H
H
L
L
L
L
L
µ
All major programming vendors offer worldwide support for
the Atmel microcontroller series. Please contact your local
programming vendor for the appropriate software revision.
Figure 14. Verifying the QuickFlash Memory
P2.7
s for Write Lock Bits.
H
H
H
H
3-33 MHz
L
L
L
L
L
PROGRAMMING
MODES TABLE
0000H/4FFFH
SEE FLASH
P3.3
H
H
H
H
L
L
L
L
L
ADDR.
P3.6
H
H
H
H
H
L
L
L
L
A14*
A0 - A7
A8 - A13
P3.7
H
H
H
L
L
L
L
L
L
P3.3
P1.0-P1.7
P2.0 - P2.5
P3.4
P2.6
P2.7
P3.6
P3.7
XTAL 2
XTAL1
GND
D2, 3, 4
P0.7-0
Data
D
1EH
87H
05H
AT87F55WD
D
OUT
X
X
X
IN
P3.4
A14
A14
PSEN
X
X
X
X
X
X
X
RST
ALE
V
EA
P0
CC
Address
P2.5-0
A13-8
A13-8
X
X
X
X
X
X
X
+5V
PGM DATA
(USE 10K
PULLUPS)
P1.7-0
V
V
000H
100H
200H
A7-0
A7-0
IH
IH
X
X
X
X