GMS90 Hynix Semiconductor, GMS90 Datasheet - Page 16

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

CPU
The GMS90 series is efficient both as a controller and as an arithmetic processor. It has extensive facilities for
binary and BCD arithmetic and excels in its bit-handling capabilities. Efficient use of program memory results
from an instruction set consisting of 44% one-byte, 41% two-byte, and 15% three-byte instructions. With a 12
MHz crystal, 58% of the instructions are executed in 1.0 s (40MHz: 300ns).
Special Function Register PSW
Reset value of PSW is 00
12
RS1
0
0
1
1
AC
OV
Bit
CY
F0
F1
P
Addr. D0
Bit No.
RS0
0
1
0
1
H
H
.
CY
MSB
7
Carry Flag
Auxiliary Carry Flag (for BCD operations)
General Purpose Flag
Register Bank select control bits
Bank 0 selected, data address 00
Bank 1 selected, data address 08
Bank 2 selected, data address 10
Bank 3 selected, data address 18
Overflow Flag
General Purpose Flag
Parity Flag
Set/cleared by hardware each instruction cycle to indicate an odd/even
number of "one" bits in the accumulator, i.e. even parity.
AC
6
F0 RS1 RS0 OV
5
4
3
2
Function
H
H
H
H
F1
1
- 07
- 0F
- 17
- 1F
H
H
H
H
LSB
P
0
PSW
Dec. 1998 Ver 3.0
GMS90 Series