UPD77016 NEC, UPD77016 Datasheet - Page 20

• Manufacturer Part Number: UPD77016
• Description: 16 bits/ Fixed-point Digital Signal Processor
• Manufacturer: NEC

2.5 On-chip Peripheral Circuit
They are mapped in both X and Y memory areas, and are accessed as memory mapped I/O by the PD77016
CPU.
2.5.1 Serial Interface Outline
can be programmed independently to be 8 bits or 16 bits. MSB first or LSB first can also be selected. Data is
input/output by hand shaking for an external device, and by interrupts, polling or wait function in internal.
2.5.2 Host Interface Outline
controller. When an external device accesses host interface, HA0 and HA1 pins; which are host address input
pins; specifies bit 15 to bit 8 and bit 7 to bit 0. The PD77016 includes 3 registers consisting of 16 bits, which
are dedicated for input data, output data and status. The PD77016 has three types of interface method for
internal and external data; interrupts, polling and wait function.
2.5.3 General Input/output Ports Outline
two registers. One is 4 bits register for input/output data, and the other is 16 bits for control.
2.5.4 Wait Cycle Register
accessed. 0, 1, 3, or 7 wait cycle can be set in every data area which is divided into 8, and in every X and Y
memory area which is divided into 4.
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The PD77016 includes serial interface, host interface, general input/output ports and wait cycle registers.
The PD77016 has 2 channel serial interfaces. Serial I/O clock must be provided from external. Frame length
The PD77016 has 8 bits parallel ports as host interface to input/output data to and from host CPU and DMA
General input/output ports consist of 4 bits. User can set each port as input or output. The PD77016 includes
The wait cycle registers consist of 16 bits. It is used to set wait cycle number when external memory is
When data area is accessed, wait cycle can be also set by WAIT pin.
PD77016