Version 3.1a
Published by
MCU Application Team
©
2001 Hynix semiconductor All right reserved.
Additional information of this manual may be served by Hynix semiconductor offices in Korea or Distributors
and Representatives listed at address directory.
Hynix semiconductor reserves the right to make changes to any information here in at any time without notice.
The information, diagrams and other data in this manual are correct and reliable; however, Hynix semiconduc-
tor is in no way responsible for any violations of patents or other rights of the third party generated by the use
of this manual.
GMS90 Series
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
128
×
8
T0
CPU
T1
ROM / EPROM
4K
×
8
8-BIT
USART
PORT 0
I/O
PORT 1
I/O
I/O
PORT 2
PORT 3
I/O
Oct. 2000 Ver 3.1a
1
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