AT89LP52-20MU Atmel, AT89LP52-20MU Datasheet - Page 49

• Manufacturer Part Number: AT89LP52-20MU
• Description: IC MCU 8051 8K FLASH SPI 44VQFN
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP52-20MU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-VFQFN Exposed Pad
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: Serial
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

Figure 11-5. Timer 0/1 Toggle Mode 2 Waveform
Table 11-4.
3709B–MICRO–12/10
TMOD Address = 089H
Not Bit Addressable
Symbol
GATE1
C/T1
T1M1
T1M0
GATE0
C/T0
T0M1
T0M0
Bit
GATE1
Function
Timer 1 Gating Control. When set, Timer/Counter 1 is enabled only while INT1 pin is high and TR1 control pin is set.
When cleared, Timer 1 is enabled whenever TR1 control bit is set.
Timer or Counter Selector 1. Cleared for Timer operation (input from internal system clock). Set for Counter operation
(input from T1 input pin). C/T1 must be zero when using Timer 1 in Clock Out mode.
Timer 1 Operating Mode
Mode
0
1
2
3
Timer 0 Gating Control. When set, Timer/Counter 0 is enabled only while INT0 pin is high and TR0 control pin is set.
When cleared, Timer 0 is enabled whenever TR0 control bit is set.
Timer or Counter Selector 0. Cleared for Timer operation (input from internal system clock). Set for Counter operation
(input from T0 input pin). C/T0 must be zero when using Timer 0 in Clock Out mode.
Timer 0 Operating Mode
Mode
0
1
2
3
7
TMOD – Timer/Counter Mode Control Register
T1M1
0
0
1
1
T0M1
0
0
1
1
C/T1
FFh
THx
6
Tx
T1M0
0
1
0
1
T0M0
0
1
0
1
T1M1
5
Operation
13-bit Timer Mode. 8-bit Timer/Counter TH1 with TL1 as 5-bit prescaler.
16-bit Timer Mode. TH1 and TL1 are cascaded to form a 16-bit Timer/Counter.
8-bit Auto Reload Mode. TH1 holds a value which is reloaded into 8-bit Timer/Counter
TL1 each time it overflows.
Timer/Counter 1 is stopped
Operation
13-bit Timer Mode. 8-bit Timer/Counter TH0 with TL0 as 5-bit prescaler.
16-bit Timer Mode. TH0 and TL0 are cascaded to form a 16-bit Timer/Counter.
8-bit Auto Reload Mode. TH0 holds a value which is reloaded into 8-bit Timer/Counter
TL0 each time it overflows.
Split Timer Mode. TL0 is an 8-bit Timer/Counter controlled by the standard Timer 0
control bits. TH0 is an 8-bit timer only controlled by Timer 1 control bits.
T1M0
4
GATE0
3
AT89LP51/52 - Preliminary
C/T0
2
Reset Value = 0000 0000B
T0M0
1
T0M1
0
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