AT89C51RD2 Atmel Corporation, AT89C51RD2 Datasheet - Page 32

• Manufacturer Part Number: AT89C51RD2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RD2

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 2
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

12.3
32
Registers
AT89C51RD2/ED2
It is possible to use Timer 2 as a baud rate generator and a clock generator simultaneously. For
this configuration, the baud rates and clock frequencies are not independent since both func-
tions use the values in the RCAP2H and RCAP2L registers.
Figure 12-2. Clock-out Mode C/T2 = 0
Table 12-1.
T2CON - Timer 2 Control Register (C8h)
TF2
7
T2EX
T2CON Register
FCLK PERIPH
EXF2
6
T2
RCLK
5
:6
TCLK
4
T2CON
EXEN2
Q
Toggle
T2CON
EXEN2
TR2
D
3
T2CON
RCAP2L
TR2
EXF2
(8-bit)
(8-bit)
2
TL2
T2MOD
T2OE
RCAP2H
(8-bit)
(8-bit)
TH
C/T2#
2
1
INTERRUPT
TIMER 2
4235K–8051–05/08
OVER-
FLOW
CP/RL2#
0