Hyundai gms90x52c User Manual

Jan. 2001   Ver 1.0

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• 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)

• 8K/16K  bytes  ROM

• 256 

×

 8 RAM

• 64K external program memory space

• 64K external data memory space

• Four 8-bit ports

• Three 16-bit Timers / Counters (Timer2 with up/down counter feature)

• USART

• One clock output port

• Programmable ALE pin enable / disable (Low EMI)

• Six 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

RAM

256 

×

 8

PORT 0

PORT 1

PORT 3

PORT 2

8-BIT

USART

ROM / EPROM

GMS90X52C:   8K 

×

 8

CPU

T 0

T 1

I/O

I/O

I/O

I/O

T 2

GMS90X54C: 16K 

×

 8