GMS90 Hynix Semiconductor, GMS90 Datasheet - Page 17

• Manufacturer Part Number: GMS90
• Description: 8-BIT SINGLE-CHIP MICROCONTROLLERS
• Manufacturer: Hynix Semiconductor

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
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 8E
Dec. 1998 Ver 3.0
GMS9XX51/52
Address
8EH
8AH
8BH
8CH
8DH
80H
81H
82H
83H
84H
85H
86H
87H
88H
89H
8FH
8E
H
3)
reserved
Register
reserved
reserved
reserved
reserved
TCON
PCON
TMOD
P0
DPH
DPL
TH0
TH1
TL0
TL1
SP
3)
1)
1)
XXXXXXXX
Contents after
0XX0000
XXH
XXH
XXH
XXH
Reset
FFH
07H
00H
00H
00H
00H
00H
00H
00H
00H
3)
2)
2)
2)
2)
B
B
2)
2)
GMS9XX54/56/58
H
.
Address
8E
9CH
9DH
90H
91H
92H
93H
94H
95H
96H
97H
98H
99H
9AH
9BH
9EH
9FH
H
AUXR0
Register
reserved
reserved
reserved
reserved
reserved
reserved
reserved
reserved
reserved
reserved
reserved
reserved
reserved
SCON
SBUF
P1
1)
1)
XXXXXXX0
Contents after
XXH
XXH
XXH
XXH
XXH
XXH
XXH
XXH
XXH
XXH
XXH
XXH
XXH
Reset
FF
00H
00
H
H
2)
2)
2)
2)
2)
2)
2)
2)
2)
2)
2)
2)
2)
B
2)
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