AT89LP428-20AU Atmel, AT89LP428-20AU Datasheet - Page 136

• Manufacturer Part Number: AT89LP428-20AU
• Description: MCU 8051 4K FLASH SPI 32TQFP
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP428-20AU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 30
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-TQFP, 32-VQFP
• Processor Series: AT89x
• Core: 8051
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: AT89ISP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -
• Lead Free Status / Rohs Status: Details

24.8
The values in this table are valid for V
Figure 24-15. Shift Register Mode Timing Waveform
24.9
24.9.1
Note:
24.9.2
Note:
136
Symbol
t
t
t
t
t
XLXL
QVXH
XHQX
XHDX
XHDV
Serial Port Timing: Shift Register Mode
Test Conditions
1. AC Inputs during testing are driven at V
1. For timing purposes, a port pin is no longer floating when a 100 mV change from load voltage occurs. A port pin begins to
AT89LP428/828
AC Testing Input/Output Waveform
Float Waveform
Write to SBUF
V
float when 100 mV change from the loaded V
Output Data
Input Data
Parameter
Serial Port Clock Cycle Time
Output Data Setup to Clock Rising Edge
Output Data Hold after Clock Rising Edge
Input Data Hold after Clock Rising Edge
Input Data Valid to Clock Rising Edge
IH
Clear RI
min. for a logic “1” and V
Clock
(1)
Valid
0
IL
CC
max. for a logic “0”.
= 2.4V to 5.5V and Load Capacitance = 80 pF.
Valid
1
CC
(1)
- 0.5V for a logic “1” and 0.45V for a logic “0”. Timing measurements are made at
OH
Valid
/V
OL
2
level occurs.
Valid
3
Valid
4
2t
t
t
Valid
CLCL
CLCL
CLCL
Min
5
15
Variable Oscillator
0
-15
-15
-15
Valid
6
Max
Valid
7
3654A–MICRO–8/09
Units
µs
ns
ns
ns
ns