AT89C51AC2-RLTUM Atmel, AT89C51AC2-RLTUM Datasheet - Page 112
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AT89C51AC2-RLTUM
Manufacturer Part Number
AT89C51AC2-RLTUM
Description
IC 8051 MCU FLASH 32K 44VQFP
Manufacturer
Atmel
Series
89Cr
Datasheet
1.AT89C51AC2-RLTUM.pdf
(121 pages)
Specifications of AT89C51AC2-RLTUM
Core Processor
8051
Core Size
8-Bit
Speed
40MHz
Connectivity
UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
34
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
1.25K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Processor Series
AT89x
Core
8051
Data Bus Width
8 bit
Data Ram Size
1280 B
Interface Type
UART
Maximum Clock Frequency
40 MHz
Number Of Programmable I/os
34
Number Of Timers
3
Operating Supply Voltage
3 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 8 Channel
For Use With
AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCU
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Clock Waveforms
This diagram indicates when signals are clocked internally. The time it takes the signals to propagate to the pins, however,
ranges from 25 to 125 ns. This propagation delay is dependent on variables such as temperature and pin loading. Propa-
gation also varies from output to output and component. Typically though (T
delays are approximately 50ns. The other signals are typically 85 ns. Propagation delays are incorporated in the AC
specifications.
112
EXTERNAL PROGRAM MEMORY FETCH
READ CYCLE
WRITE CYCLE
PORT OPERATION
SERIAL PORT SHIFT CLOCK
MOV PORT SRC
INTERNAL
A/T89C51AC2
MOV DEST PORT (P1. P2. P3)
(INCLUDES INTO. INT1. TO T1)
P2 (EXT)
MOV DEST P0
TXD (MODE 0)
CLOCK
XTAL2
PSEN
ALE
WR
RD
P0
P0
P2
P0
P2
SAMPLED
DATA
STATE4
P1
FLOAT
P2
STATE5
P1
Valid in normal clock mode. In X2 mode XTAL2 must be changed to XTAL2/2.
PCL OUT
INDICATES ADDRESS TRANSITIONS
DPL OR Rt OUT
DPL OR Rt OUT
P0 PINS SAMPLED
P2
P1, P2, P3 PINS SAMPLED
RXD SAMPLED
INDICATES DPH OR P2 SFR TO PCH TRANSITION
INDICATES DPH OR P2 SFR TO PCH TRANSITION
STATE6
P1
OLD DATA NEW DATA
P2
FLOAT
SAMPLED
DATA
STATE1
P1
P2
STATE2
P1
PCL OUT
THESE SIGNALS ARE NOT ACTIVATED DURING THE
EXECUTION OF A MOVX INSTRUCTION
DATA OUT
FLOAT
P2
SAMPLED
DATA
STATE3
P1
A
=25°C fully loaded) RD and WR propagation
P2
FLOAT
P1, P2, P3 PINS SAMPLED
P0 PINS SAMPLED
SAMPLED
DATA
STATE4
P1
PCL OUT (EVEN IF PROGRAM
MEMORY IS INTERNAL)
P2
RXD SAMPLED
MEMORY IS EXTERNAL)
PCL OUT (IF PROGRAM
PCL OUT (IF PROGRAM
MEMORY IS EXTERNAL)
STATE5
P1
PCL OUT
P2
4127H–8051–02/08