AT89C52-20QC Atmel, AT89C52-20QC Datasheet - Page 8

• Manufacturer Part Number: AT89C52-20QC
• Description: Microcontrollers (MCU) Microcontroller
• Manufacturer: Atmel

Specifications of AT89C52-20QC

• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 8 KB
• Data Ram Size: 256 B
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Package / Case: PQFP-44
• Minimum Operating Temperature: 0 C
• Lead Free Status / Rohs Status: No

Figure 2. Timer 2 Auto Reload Mode (DCEN = 0)
Table 4. T2MOD – Timer 2 Mode Control Register
8
Symbol
–
T2OE
DCEN
T2MOD Address = 0C9H
Not Bit Addressable
Bit
T2EX PIN
OSC
T2 PIN
–
7
Function
Not implemented, reserved for future
Timer 2 Output Enable bit.
When set, this bit allows Timer 2 to be configured as an up/down counter.
÷12
AT89C52
TRANSITION
DETECTOR
–
6
C/T2 = 0
C/T2 = 1
–
5
EXEN2
TR2
–
4
CONTROL
CONTROL
RELOAD
–
3
RCAP2H
TH2
–
2
RCAP2L
TL2
Reset Value = XXXX XX00B
T2OE
OVERFLOW
1
EXF2
TF2
DCEN
0
INTERRUPT
TIMER 2