Hello Dear Ahmad
I think Atmega128 is the best solution
see the Features,your specs are defined by 1) 2) ...

Features:
* High-performance, Low-power AVR® 8-bit Microcontroller
* Advanced RISC Architecture
– 133 Powerful Instructions – Most Single Clock Cycle Execution
1) 32 x 8 General Purpose Working Registers + Peripheral Control Registers
– Fully Static Operation
– Up to 16 MIPS Throughput at 16 MHz
– On-chip 2-cycle Multiplier
* Nonvolatile Program and Data Memories
2) 128K Bytes of In-System Reprogrammable Flash
Endurance: 1,000 Write/Erase Cycles
– Optional Boot Code Section with Independent Lock Bits
In-System Programming by On-chip Boot Program
True Read-While-Write Operation
– 4K Bytes EEPROM
Endurance: 100,000 Write/Erase Cycles
– 4K Bytes Internal SRAM
3) Up to 64K Bytes Optional External Memory Space
– Programming Lock for Software Security
SPI Interface for In-System Programming
- JTAG (IEEE std. 1149.1 Compliant) Interface
– Boundary-scan Capabilities According to the JTAG Standard
– Extensive On-chip Debug Support
– Programming of Flash, EEPROM, Fuses and Lock Bits through the JTAG Interface
* Peripheral Features
– Two 8-bit Timer/Counters with Separate Prescalers and Compare Modes
– Two Expanded 16-bit Timer/Counters with Separate Prescaler, Compare Mode and
Capture Mode
– Real Time Counter with Separate Oscillator
– Two 8-bit PWM Channels
– 6 PWM Channels with Programmable Resolution from 2 to 16 Bits
– Output Compare Modulator
– 8-channel, 10-bit ADC
8 Single-ended Channels
7 Differential Channels
2 Differential Channels with Programmable Gain at 1x, 10x, or 200x
4) Byte-oriented Two-wire Serial Interface
5) Dual Programmable Serial USARTs
6) Master/Slave SPI Serial Interface
– Programmable Watchdog Timer with On-chip Oscillator
– On-chip Analog Comparator
* Special Microcontroller Features
– Power-on Reset and Programmable Brown-out Detection
– Internal Calibrated RC Oscillator
– External and Internal Interrupt Sources
– Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby,
and Extended Standby
– Software Selectable Clock Frequency
– ATmega103 Compatibility Mode Selected by a Fuse
– Global Pull-up Disable
* I/O and Packages
– 53 Programmable I/O Lines
– 64-lead TQFP
* Operating Voltages
– 2.7 - 5.5V for ATmega128L
– 4.5 - 5.5V for ATmega128
* Speed Grades
– 0 - 8 MHz for ATmega128L
– 0 - 16 MHz for ATmega128

Regards
Mehdi N.Rahni