GMS90C3X Datasheet, PDF (16/59 Pages) Hynix Semiconductor – HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS90 Series
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 1.0µs (40MHz: 300ns).
Special Function Register PSW
Bit No.
Addr. D0_H
MSB
LSB
7
6
5
4
3
2
1
0
CY AC F0 RS1 RS0 OV F1 P
PSW
Bit
CY
AC
F0
RS1
RS0
0
0
0
1
1
0
1
1
OV
F1
P
Reset value of PSW is 00_H.
Function
Carry Flag
Auxiliary Carry Flag (for BCD operations)
General Purpose Flag
Register Bank select control bits
Bank 0 selected, data address 00_H - 07_H
Bank 1 selected, data address 08_H - 0F_H
Bank 2 selected, data address 10_H - 17_H
Bank 3 selected, data address 18_H - 1F_H
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.
12
Oct. 2000 Ver 3.1a