
33
AT8xC5122/23
4202E–SCR–06/06
Special Function
Registers (SFR’s)
Introduction The Special Function Registers (SFRs) of the AT8xC5122/23 can be ranked into the fol-
lowing categories:
• C51 Core Registers: ACC, B, DPH, DPL, PSW, SP
• System Configuration Registers: PCON, CKRL, CKCON0, CKCON1, CKSEL,
PLLCON, PLLDIV, AUXR, AUXR1, RCON
• I/O Port Registers: P0, P1, P2, P3, P4, P5, PMOD1, PMOD2
• Timer Registers: TCON, TH0, TH1, TMOD, TL0, TL1
• Watchdog (WD) Registers: WDTRST, WDTPRG
• Serial I/O Port Registers: SADDR, SADEN, SBUF, SCON
• Baud Rate Generator (BRG) Registers: BRL, BDRCON
• System Interrupt Registers: IE0, IPL0, IPH0, IE1, IPL1, IPH1
• Smart Card Interface (SCI) Registers: SCSR, SCCON/SCETU0, SCISR/SCETU1,
SCIER/SCIIR, SCIBUF, SCGT0/SCWT0, SCGT1/SCWT1, SCICR/SCWT2, SCICLK
• DC/DC Converter Registers: DCCKPS
• Keyboard Interface Registers: KBE, KBF, KBLS
• Serial Port Interface (SPI) Registers: SPCON, SPSTA, SPDAT
• Universal Serial Bus (USB) Registers:USBCON, USBADDR, USBINT, USBIEN,
UEPNUM, UEPCONX, UEPSTAX, UEPRST, UEPINT, UEPIEN, UEPDATX,
UBYCTX, UFNUML, UFNUMH
• LED Controller Registers: LEDCON0, LEDCON1
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