UPD77115 Просмотр технического описания (PDF) - NEC => Renesas Technology

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UPD77115

16-BIT FIXED-POINT DIGITAL SIGNAL PROCESSOR

NEC => Renesas Technology 

µPD77115, 77115A

2. FUNCTION OUTLINE

2.1 Program Control Unit

This unit is used to execute instructions, and control branching, loops, interrupts, the clock, and the standby mode

of the DSP.

2.1.1 CPU control

A three-stage pipeline architecture is employed and almost all the instructions, except some instructions such as

branch instructions, are executed in one system clock.

2.1.2 Interrupt control

Interrupt requests input from external pins (INT1 to INT4) or generated by the internal peripherals (serial interface

and host interface) are serviced. The interrupt of each interrupt source can be enabled or disabled. Multiple interrupts

are also supported.

2.1.3 Loop control task

A loop function without any hardware overhead is provided. A loop stack with four levels is provided to support

multiple loops.

2.1.4 PC stack

A 15-level PC stack that stores the program counter supports multiple interrupts and subroutine calls.

2.1.5 PLL

A PLL is provided as a clock generator that can multiply an external clock input to supply an operating clock to the

DSP. A multiple of ×1 to ×16 can be set by pins(PLL0 to PLL3).

Two standby modes are available for lowering the power consumption while the DSP is not in use.

• HALT mode : Set by execution of the HALT instruction. The current consumption drops to several mA. The

normal operation mode is recovered by an interrupt or hardware reset.

• STOP mode: Set by execution of the STOP instruction. The current consumption drops to several 10 µA. The

normal operation mode is recovered by hardware reset or WAKEUP pin.

2.1.6 Instruction memory

64 words of the instruction RAM are allocated to interrupt vectors.

A boot-up ROM that boots up the instruction RAM is provided, and the instruction RAM can be initialized or

rewritten by host boot (boot via host interface).

The µPD77115 has 11.5K-word instruction RAM.

Data Sheet U14867EJ5V0DS

15

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