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GMS90C51 Datasheet(PDF) 16 Page - Hynix Semiconductor

Part # GMS90C51
Description  8-BIT SINGLE-CHIP MICROCONTROLLERS
PDF  59 Pages
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Manufacturer  HYNIX [Hynix Semiconductor]
Direct Link  http://www.skhynix.com/kor/main.do
Logo HYNIX - Hynix Semiconductor

GMS90C51 Datasheet(HTML) 16 Page - Hynix Semiconductor

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GMS90 Series
12
Dec. 1998 Ver 3.0
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
µs (40MHz: 300ns).
Special Function Register PSW
Reset value of PSW is 00H.
Bit
Function
CY
Carry Flag
AC
Auxiliary Carry Flag (for BCD operations)
F0
General Purpose Flag
RS1
0
0
1
1
RS0
0
1
0
1
Register Bank select control bits
Bank 0 selected, data address 00H - 07H
Bank 1 selected, data address 08H - 0FH
Bank 2 selected, data address 10H - 17H
Bank 3 selected, data address 18H - 1FH
OV
Overflow Flag
F1
General Purpose Flag
P
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.
CY
AC
F0
RS1 RS0 OV
F1
P
7
6
54
32
10
LSB
MSB
Bit No.
Addr. D0H
PSW



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