Hyundai GMS90X51C, GMS90X52C, GMS90X54C GMS90C52C/54C GMS90L52C/54C(Low voltage versions)

GMS90X5XC Series HYUNDAI MicroElectronics
Jan. 2001 Ver 1.0 1
GMS90C52C/54C
GMS90L52C/54C(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)
•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
Block Diagram
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