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GMS90X5XC Series HYUNDAI MicroElectronics
Jan. 2001 Ver 1.0
GMS90C51C
GMS90L51C(Low voltage versions)
• Fully compatible to standard MCS-51 microcontroller
• Wide operating frequency up to 40MHz
(for more detail, see “GMS90X5XC Series Selection Guide”)
• X2 Speed Improvement capability (
6 clocks/machine cycle
)
20MHz @5V (Equivalent to 40MHz @5V)
8MHz @3V (Equivalent to 16MHz @3V)
•4K
×
8 ROM
• 128
×
8 RAM
• 64K external program memory space
• 64K external data memory space
• Four 8-bit ports
• Two 16-bit Timers / Counters
•USART
• Programmable ALE pin enable / disable (Low
EMI
)
• Five interrupt sources, two priority levels
• Power saving Idle and power down mode
• 2.7Volt low voltage version available
• P-DIP-40, P-LCC-44, P-MQFP-44 package
Block Diagram
RAM
128
×
8
PORT 0
PORT 1
PORT 3
PORT 2
8-BIT
USART
ROM / EPROM
4K
×
8
CPU
T 0
T 1
I/O
I/O
I/O
I/O