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GMS90C3X Datasheet, PDF (17/59 Pages) Hynix Semiconductor – HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS
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GMS90 Series
SPECIAL FUNCTION REGISTERS
All registers, except the program counter and the four general purpose register banks, reside in the special func-
tion register area.
The 28 special function registers (SFR) include pointers and registers that provide an interface between the CPU
and the other on-chip peripherals. There are also 128 directly addressable bits within the SFR area.
All SFRs are listed in Table 1, Table 1, and Table 3.
In Table 1 they are organized in numeric order of their addresses. In Table 2 they are organized in groups which
refer to the functional blocks of the GMS90 series. Table 3 illustrates the contents of the SFRs.
Table 1. Special Function Registers in Numeric Order of their Addresses
Address
80H
81H
82H
83H
84H
85H
86H
87H
88H
89H
8AH
8BH
8CH
8DH
8EH 3)
8FH
Register
P0 1)
SP
DPL
DPH
reserved
reserved
reserved
PCON
TCON 1)
TMOD
TL0
TL1
TH0
TH1
+ 3)
reserved
Contents after
Reset
FFH
07H
00H
00H
XXH 2)
XXH 2)
XXH 2)
0XX0000B 2)
00H
00H
00H
00H
00H
00H
+ 3)
XXH 2)
Address
90H
91H
92H
93H
94H
95H
96H
97H
98H
99H
9AH
9BH
9CH
9DH
9EH
9FH
1) Bit-addressable Special Function Register.
2) X means that the value is indeterminate and the location is reserved.
3) The GMS9XX54/56/58 have the AUXR0 register at address 8EH.
GMS9XX51/52
GMS9XX54/56/58
8EH
reserved
XXXXXXXXB2)
8EH
Register
P1 1)
reserved
reserved
reserved
reserved
reserved
reserved
reserved
SCON 1)
SBUF
reserved
reserved
reserved
reserved
reserved
reserved
AUXR0
Contents after
Reset
FFH
00H
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
00H
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXH 2)
XXXXXXX0B2)
Oct. 2000 Ver 3.1a
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