GMS90 Series
HYUNDAI MicroElectronics
GMS90C31/51, 97C51
GMS90L31/51, 97L51 (Low voltage versions)
• Fully compatible to standard MCS-51 microcontroller
• Wide operating frequency up to 40MHz (for more detail, see “GMS90 Series Selection Guide”)
• 4K × 8 (EP)ROM
• 128 × 8 RAM
• 64K external program memory space
• 64K external data memory space
• Four 8-bit ports
• Two 16-bit Timers / Counters
• USART
• Five interrupt sources, two priority levels
• Power saving Idle and power down mode
• Quick pulse programming algorithm (in the OTP devices)
• 2-level program memory lock (in the OTP devices)
• 2.7Volt low voltage version available
• P-DIP-40, P-LCC-44, P-MQFP-44 package
Block Diagram
RAM
I/O
PORT 0
128 × 8
T 0
T 1
I/O
I/O
I/O
PORT 1
PORT 2
PORT 3
8-BIT
USART
CPU
ROM / EPROM
4K × 8
Oct. 2000 Ver 3.1a
1
HYNIX [ HYNIX SEMICONDUCTOR ]
