Hardware manual

Common Features Description
2-44 Atmel 8051 Microcontrollers Hardware Manual
4316A–8051–01/04
Table 2-14. TL2 Register - TL2 (S:CCh)
Timer 2 Low Byte Register
Reset Value = 0000 0000b
Not bit addressable
Table 2-15. RCAP2H Register -RCAP2H (S:CBh)
Timer 2 Reload/Capture High Byte Register
Reset Value = 0000 0000b
Not bit addressable
Table 2-16. RCAP2L Register - RCAP2L (S:CAh)
Timer 2 Reload/Capture Low Byte Register
Reset Value = 0000 0000b
Not bit addressable
2.13 Serial Interface It provides both synchronous and asynchronous communication modes. It operates as a
Universal Asynchronous Receiver and Transmitter (UART) in three full-duplex modes
(Modes 1, 2 and 3). Asynchronous transmission and reception can occur simultaneously
and at different baud rates.
It is also receive-buffered, meaning it can commence reception of a second byte before
a previously received byte has been read from the receive register. (However, if the first
byte still hasn’t been read by the time reception of the second byte is complete, one of
the bytes will be lost). The serial port receive and transmit registers are both accessed
at Special Function Register SBUF. Writing to SBUF loads the transmit register, and
reading SBUF accesses a physically second receive register.
76543210
--------
Bit
Number
Bit
Mnemonic Description
7:0 Low Byte of Timer 2.
76543210
--------
Bit
Number
Bit
Mnemonic Description
7:0 High Byte of Timer 2 Reload/Capture.
76543210
--------
Bit
Number
Bit
Mnemonic Description
7:0 Low Byte of Timer 2 Reload/Capture.