AT87F55WD-24AI Atmel, AT87F55WD-24AI Datasheet - Page 11

• Manufacturer Part Number: AT87F55WD-24AI
• Description: IC MICRO CTRL 24MHZ 44PLCC
• Manufacturer: Atmel
• Series: 87Fr

Specifications of AT87F55WD-24AI

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 24MHz
• Connectivity: UART/USART
• Peripherals: WDT
• Number Of I /o: 32
• Program Memory Size: 20KB (20K x 8)
• Program Memory Type: OTP Quick FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Other names: AT87F55WD24AI

Figure 7. Timer 2 Auto Reload Mode (DCEN = 1)
Figure 8. Timer 2 in Baud Rate Generator Mode
T2EX PIN
OSC
OSC
T2 PIN
T2 PIN
12
÷
2
TRANSITION
DETECTOR
NOTE: OSC. FREQ. IS DIVIDED BY 2, NOT 12
C/T2 = 0
C/T2 = 1
C/T2 = 0
C/T2 = 1
TR2
EXEN2
CONTROL
TR2
(DOWN COUNTING RELOAD VALUE)
CONTROL
CONTROL
(UP COUNTING RELOAD VALUE)
RCAP2H
0FFH
TH2
RCAP2H
TH2
EXF2
RCAP2L
0FFH
RCAP2L
TL2
TL2
OVERFLOW
INTERRUPT
TIMER 2
T2EX PIN
÷
2
"1"
"1"
TIMER 1 OVERFLOW
COUNT
DIRECTION
1=UP
0=DO
"0"
"0"
"0"
TOGGLE
"1"
INTERRUPT
TIMER 2
÷
÷
SMOD1
RCLK
TCLK
16
TF2
16
CLOCK
CLOCK
EXF2
Rx
Tx
11