UPD77111 NEC, UPD77111 Datasheet - Page 22

• Manufacturer Part Number: UPD77111
• Description: 16-BIT FIXED-POINT DIGITAL SIGNAL PROCESSORS
• Manufacturer: NEC

2.3 Data Memory Unit
2.3.1 Data memory
memory (X data memory and Y data memory). A 64-word peripheral area is assigned in the data memory space.
2.3.2 Data addressing unit
DMY), and an address ALU.
2.4 Peripheral Units
peripherals are mapped to the X data memory and Y data memory spaces, and are accessed from program as
memory-mapped I/Os.
2.4.1 Serial interface (SIO)
2.4.2 Host interface (HIO)
the DSP, a 16-bit register is mapped to memory for input data, output data, and status. Handshaking with an external
device is implemented by using a dedicated status signal. Handshaking with internal units is achieved by means of
polling, wait, or interrupts.
2.4.3 General-purpose I/O port (PIO)
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The data memory unit consists of two banks of data memory and two data addressing units.
The capacity and type of the memory differ depending on the model of the DSP. All DSPs have two banks of data
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In addition, some models have an external data memory interface so that the external memory can be expanded.
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An independent data addressing unit is provided for each of the X data memory and Y data memory spaces.
Each data addressing unit has four data pointers (DPn), four index registers (DNn), one modulo register (DMX or
A serial interface, host interface, general-purpose I/O port, and wait cycle register are provided. All these internal
Two serial interfaces are provided. These serial interfaces have the following features:
• Serial clock : Supplied from external source to each interface. The same clock is used for input and output
• Frame length: 8 or 16 bits, and MSB or LSB first selectable for each interface and input or output
• Handshake : Handshaking with external devices is implemented with a dedicated status signal. With the
This is an 8-bit parallel port that inputs data from or outputs data to an external host CPU or DMA controller. In
This is a 4-bit I/O port that can be set in the input or output mode in 1-bit units.
PD77110: RAM of 24K words
PD77111, 77112: RAM of 3K words
PD77110: External data memory of 32K words
PD77112: External data memory of 16K words
on the interface.
internal units, polling, wait, or interrupt are used.
2 banks
2 banks and ROM of 16K words
Data Sheet U12801EJ4V0DS00
2 banks
2 banks
2 banks
PD77110, 77111, 77112