special function register ??

register(msb) (lsb)byte
symbolb7b6b5b4b3b2b1b0address

p0p0.7p0.6p0.5p0.4p0.3p0.2p0.1p0.080h(128)
sp81h(129)
dpl82h(130)
dph83h(131)
pcon smod---gf1gf0pdidl87h(135)
*pcon smod--wlegf1gf0pdidl87h(135)
tcon tf1tr1tf0tr0ie1it1ie0it088h(136)
tmod gatec/tm1m0gatec/tm1m089h(137)
tl08ah(138)
tl18bh(139)
th08ch(140)
th18dh(141)
p1 p1.7p1.6p1.5p1.4p1.3p1.2t2ext290h(144)
*p1 sdasclrt2t2ct3ict2ict1ict0i90h(144)
scon sm0sm1sm2rentb8rb8tiri98h(152)
sbuf99h(153)
p2 p2.7p2.6p2.5p2.4p2.3p2.2p2.1p2.00a0h(208)
ie ea-et2eset1ex1et0ex00a8h(168)
*ien0 eaeades1es0et1ex1et0ex00a8h(168)
+cml0 0a9h(169)
+cml1 0aah(170)
+cml2 0abh(171)
+ctl0 0ach(172)
+ctl1 0adh(173)
+ctl2 0aeh(174)
+ctl3 0afh(175)
p3 rdwrt1t0int1int0txdrxd0b0h(176)
ip --pt2pspt1px1pt0px00b8h(184)
*ip0 -padps1ps0pt1px1pt0px00b8h(184)
+p4 cmt1 cmt0cmsr5 cmsr4 cmsr3 cmsr2 cmsr1 cmsr00c0h(192)
+p5 adc7adc6adc5adc4adc3adc2adc1adc00c4h(196)
+adcon adc.1 adc.0 adexadciadcsaadr2 aadr1 aadr00c5h(197)
+adch 0c6h(198)
t2con tf2exf2rclktclk 矱xen2tr2c/t2 矯p/rl20c8h(200)
*tm2ir t2ovcmi2cmi1cmi0cti3cti2cti1cti00c8h(200)
+cmh0 0c9h(201)
rcap2l0cah(202)
*cmh1 0cah(202)
rcap2h0cbh(203)
*cmh2 0cbh(203)
tl2 0cch(204)
*cth0 0cch(204)
th2 0cdh(205)
*cth1 0cdh(205)
+cth2 0ceh(206)
+cth3 0cfh(207)
psw cyacf0rs1rs0ovf1p0d0h(208)
+s1con ens1stastosiaacr1cr00d8h(216)
+s1sta sc4sc3sc2sc1sc00000d9h(217)
+s1dat 0dah(218)
+s1adr slave addressgc0dbh(219)
acc acc.7 acc.6 acc.5 acc.4 acc.3 acc.2 acc.1 acc.00e0h(224)
+ien1 et2ecm2ecm1ecm0ect3ect2ect1ect00e8h(232)
+tm2cont2is1 t2is0 t2ert2b0t2p1t2p0t2ms1 t2ms00eah(234)
+ctcon ctn3ctp3ctn2ctp2ctn1ctp1ctn0ctp00ebh(235)
+tml2 0ech(236)
+tmh2 0edh(237)
+ste tg47tg46sp45sp44sp43sp42sp41sp400eeh(238)
+rte tp47tp46rp45rp44rp43rp42rp41rp400efh(239)
b b.7b.6b.5b.4b.3b.2b.1b.00f0h(240)
+ip1 pt2pcm2pcm1pcm0pct3pct2pct1pct00f8h(248)
+pwm0 0fch(252)
+pwm1 0fdh(253)
+pwmp 0feh(254)
+t3 0ffh(255)

notes: 1. * denotes the difference between 80c552 and 8051
2. + denotes the addition of 80c552