AT89LP214-20PU Atmel, AT89LP214-20PU Datasheet - Page 16

• Manufacturer Part Number: AT89LP214-20PU
• Description: MCU 8051 2K FLASH 20MHZ 14-PDIP
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP214-20PU

• 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: 12
• Program Memory Size: 2KB (2K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 14-DIP (0.300", 7.62mm)
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: SPI/UART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 2
• Operating Supply Voltage: 2.4 V to 5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: AT89ISP
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

10.2
10.3
16
Brown-out Reset
External Reset
AT89LP213/214
Table 10-1.
The AT89LP213/214 has an on-chip Brown-out Detection (BOD) circuit for monitoring the V
level during operation by comparing it to a fixed trigger level. The trigger level for the BOD is
nominally 2.2V. The purpose of the BOD is to ensure that if V
speed, the system will gracefully enter reset without the possibility of errors induced by incorrect
execution. A BOD sequence is shown in
trigger level V
trigger level, the start-up timer releases the internal reset after the specified time-out period has
expired
(See “User Configuration Fuses” on page
Figure 10-3. Brown-out Detector Reset
The P1.3/RST pin can function as either an active-LOW reset input or as a digital general pur-
pose I/O, P1.3. The Reset Pin Enable Fuse, when set to “1”, enables the external reset input
function on P1.3.
used as an input or output pin. When configured as a reset input, the pin must be held low for at
least two clock cycles to trigger the internal reset.
Note:
INTERNAL
TIME-OUT
SUT Fuse 1
RESET
V
0
0
1
1
(Table
During a power-up sequence, the fuse selection is always overridden and therefore the pin will
always function as a reset input. An external circuit connected to this pin should not hold this
pin LOW during a power-on sequence as this will keep the device in reset until the pin tran-
sitions high. After the power-up delay, this input will function either as an external reset input or
as a digital input as defined by the fuse bit. Only a power-up reset will temporarily override the
selection defined by the reset fuse bit. Other sources of reset will not override the reset fuse bit.
P1.3/RST also serves as the In-System Programming (ISP) enable. ISP is enabled when the
external reset pin is held low. When the reset pin is disabled by the fuse, ISP may only be entered
by pulling P1.3 low during power-up.
CC
BOD
V POR
Start-up Timer Settings
10-1). The Brown-out Detector must be enabled by setting the BOD Enable Fuse.
, the internal reset is immediately activated. When V
(See “User Configuration Fuses” on page
SUT Fuse 0
0
1
0
1
Clock Source
Internal RC/External Clock
Crystal Oscillator
Internal RC/External Clock
Crystal Oscillator
Internal RC/External Clock
Crystal Oscillator
Internal RC/External Clock
Crystal Oscillator
Figure
72).
V BOD
t SUT
10-3. When V
CC
72). When cleared, P1.3 may be
CC
decreases to a value below the
fails or dips while executing at
CC
increases above the
t
16 µs
1024 µs
512 µs
2048 µs
1024 µs
4096 µs
4096 µs
16384 µs
SUT
(± 5%)
3538E–MICRO–11/10
CC