AT8xC51RD2/ED2 8-bit Flash MCU - Atmel Corporation - Microcontrollers, 32-bit, and touch soluti
7 4235K–8051–05/08 AT89C51RD2/ED2 shows all SFRs with their address and their reset value. Table 3-9. Keyboard Interface SFRs Mnemonic Add Name 7 6 5 4 3 2 1 0 KBLS 9Ch Keyboard Level Selector KBLS7 KBLS6 KBLS5 KBLS4 KBLS3 KBLS2 KBLS1 ......