■ DESCRIPTION
The MB91F158 is a microcontroller for CD/DVD using a RISC-CPU (FR 30 series) as its core.

■ FEATURES
1. CPU
    • 32-bit RISC (FR30) , load/store architecture, 5-stage pipeline
    • General-purpose registers : 32 bits × 16
    • 16-bit fixed-length instructions (basic instructions) , 1 instruction/ 1 cycle
    • Memory-to-memory transfer, bit processing, barrel shift processing : Optimized for embedded applications
    • Function entrance/exit instructions, and multiple load/store instructions of register contents, instruction systems supporting high level languages
    • Register interlock functions, efficient assembly language description
    • Branch instructions with delay slots : Reduced overhead time in branching executions
    • Internal multiplier/supported at instruction level
        Signed 32-bit multiplication : 5 cycles
        Signed 16-bit multiplication : 3 cycles
    • Interrupt (PC and PS saving) : 6 cycles, 16 priority levels
    • Support for little endian mode
2. Bus Interface
    • 24-bit address output, 8/16-bit data input and output
    • Basic bus cycle : 2-clock cycle
    • Support for interface for various types of memory
    • Unused data/address pins can be configured us input/output ports
    • Support for little endian mode
3. Internal ROM
    FLASH products : 510 Kbytes
4. Internal RAM
    2 Kbytes
5. Internal Data RAM
    6 Kbytes
6. Bit Search Module
    Searches in one cycle for the position of the bit that changes from the MSB in one word to the initial I/O.
7. Timers
    • 16-bit OCU × 4 channels, ICU × 4 channels, Free-run timer × 1 channel
    • 8/16-bit up/down timer/counter (8-bit × 2 channels or 16-bit × 1 channel)
    • 16-bit PPG timer × 4 channels. The output pulse cycle and duty can be varied as desired
    • 16-bit reload timer × 2 channels
8. D/A Converter
    • 8-bit × 3 channels
9. A/D Converter (Sequential Comparison Type)
    • 10-bit × 8 channels
    • Sequential conversion method (conversion time : 5.2 µs@32 MHz)
    • Single conversion or scan conversion can be selected, and one-shot or continuous or stop conversion mode can be set respectively.
    • Conversion starting function by hardware/software.
10. Serial I/O
    • UART × 2 channels. Any of them is capable of serial transfer in sync with clock attached with the LSB/MSB switching function.
    • Serial data output and serial clock output are selectable by push-pull/open drain software.
    • A 16-bit timer (U-timer) is contained as a dedicated baud rate generator allowing any baud rate to be generated.
11. Clock Switching Function
    • Gear function : Operating clock ratios to the basic clock can be set independently for the CPU and peripherals from four types, 1 : 1, 1 : 2, 1 : 4 or 1 : 8.
12. Interrupt Controller
    External interrupt input (16 channels in total) :
    • Allows the rising edge/falling edge/H level/L level to be set.
    Internal interrupt factors :
    • Interrupt by resources and delay interrupt
13. Others
    • Reset cause : Power on reset/watchdog timer/software reset/external reset
    • Low power consumption mode : Sleep/stop
    • Package : 120-pin LQFP
    • CMOS technology (0.35 µm)
    • Power supply voltage : 3.2 V to 3.5 V
    • Operation frequency upper limit
        CPU : 32 MHz
        Peripheral circuit : 32 MHz
        External bus : 25 MHz