AT89LP214-20XU Atmel, AT89LP214-20XU Datasheet - Page 30

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

Specifications of AT89LP214-20XU

• 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-TSSOP
• Package: 14TSSOP
• Device Core: 8051
• Family Name: AT89
• Maximum Speed: 20 MHz
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 12
• Interface Type: SPI/UART
• Number Of Timers: 2
• Core: 8051
• Processor Series: AT89x
• Maximum Clock Frequency: 20 MHz
• Data Ram Size: 128 B
• Mounting Style: SMD/SMT
• Height: 1.05 mm
• Length: 5.1 mm
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.4 V
• Width: 4.5 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

14.2
14.3
30
Mode 1 – 16-bit Auto-Reload Timer/Counter
Mode 2 – 8-bit Auto-reload Timer/Counter
AT89LP213/214
In Mode 1 the Timers are configured for 16-bit auto-reload. The Timer register is run with all
16 bits. The 16-bit reload value is stored in the high and low reload registers (RH1/RL1). The
clock is applied to the combined high and low timer registers (TH1/TL1). As clock pulses are
received, the timer counts up: 0000H, 0001H, 0002H, etc. An overflow occurs on the FFFFH-to-
0000H transition, upon which the timer register is reloaded with the value from RH1/RL1 and the
overflow flag bit in TCON is set. See
gives the full 16-bit timer period compatible with the standard 8051. Mode 1 operation is the
same for Timer/Counter 0.
Figure 14-2. Timer/Counter 1 Mode 1: 16-bit Auto-reload
Mode 2 configures the Timer register as an 8-bit Counter (TL1) with automatic reload, as shown
in
TH1, which is preset by software. The reload leaves TH1 unchanged. Mode 2 operation is the
same for Timer/Counter 0.
Figure 14-3. Timer/Counter 1 Mode 2: 8-bit Auto-reload
Note:
Figure
INT1 Pin
RH1/RL1 are not required by Timer 1 during Mode 2 and may be used as temporary storage
registers.
14-3. Overflow from TL1 not only sets TF1, but also reloads TL1 with the contents of
GATE
T1 Pin
OSC
Mode 1:
Mode 2:
OSC
TR1
INT0 Pin
÷TPS
T1 Pin
GATE
Time-out Period
Time-out Period
÷TPS
C/T = 0
C/T =1
TR1
Control
C/T = 0
C/T = 1
Figure
14-2. The reload registers default to 0000H, which
=
=
Control
(
---------------------------------------------------------
Oscillator Frequency
------------------------------------------------------ -
Oscillator Frequency
65536
(8 Bits)
(8 Bits)
(
RL1
TL1
256 TH0
(8 Bits)
(8 Bits)
TL1
TH1
–
{
–
RH0 RL0
(8 Bits)
(8 Bits)
RH1
TH1
,
Reload
)
}
TF1
)
×
×
Reload
(
(
TF1
TPS
Interrupt
TPS
+
+
1
1
3538E–MICRO–11/10
)
)
Interrupt