Navigation apparatus having two processors, the first for outputting map data and the second for drawing and scrolling the map

Claim 2

A navigation apparatus which draws and displays a map on the basis of a stored map data, said apparatus comprising: a first processor which outputs drawing attribute data for drawing the map, and scroll attribute data for scrolling the map; and a second processor which receives the drawing attribute data and the scroll attribute data from said first processor, and performs a map drawing process and a map scroll process based on the drawing attribute data and the scroll attribute data.

Claim 3

A navigation apparatus according to claim 1, wherein said apparatus further comprises a map data memory which stores the map data, and which can be accessed by both of said first and second processors.

Claim 4

A navigation apparatus according to claim 1, wherein the drawing attribute data include present position information for specifying a present position, and map size information for specifying a size of the map to be drawn, and the scroll attribute data include screen display position information having information of a start position of a scroll, a direction of the scroll, and an amount of the scroll.

Claim 5

A navigation apparatus according to claim 1, wherein the drawing attribute data include present position information for specifying a present position, map size information for specifying a size of the map to be drawn, and information of a map which is to be drawn at a future time and the scroll attribute data include screen display position information having information of a start position of a scroll, a direction of the scroll, and an amount of the scroll.

Claim 6

A navigation apparatus according to claim 1, wherein said apparatus further comprises a serial communication line through which the drawing attribute data and the scroll attribute data are transmitted from said first processor to said second processor.

Claim 7

A navigation apparatus according to claim 1, further comprising: a first bus connected to said first processor; and a second bus connected to said second processor.

Claim 8

A navigation apparatus according to claim 6, further comprising a first main memory and a map data memory connected to said first bus.

Claim 9

A navigation apparatus according to claim 6, further comprising a second main memory, a graphic controller and a map drawing memory connected to said second bus.

Claim 10

A navigation apparatus which draws and displays a map on the basis of stored map data, said apparatus comprising: a map data memory which stores the map data; a first processor which outputs map data read out from said map data memory, drawing attribute data for drawing the map, and scroll attribute data for scrolling the map; a common memory which stores the outputted map data, drawing attribute data, and scroll attribute data; and a second processor which performs a map drawing process and a map scroll process on the basis of data stored in said common memory.

Claim 11

A navigation apparatus which draws and displays a map on the basis of stored map data, said apparatus comprising: a map data memory which stores the map data; a first processor which outputs map data read out from said map data memory, drawing attribute data for drawing the map, and scroll attribute data for scrolling the map; a common memory which stores the outputted map data, drawing attribute data, and scroll attribute data; and a second processor which performs a map drawing process and a map scroll process on the basis of data stored in said common memory.

Claim 12

A navigation apparatus according to claim 9, wherein the drawing attribute data include present position information for specifying a present position, map size information for specifying a size of the map to be drawn, and information of a map which is to be drawn at a future time, and the scroll attribute data include screen display position information having information of a start position of a scroll, a direction of the scroll, and an amount of the scroll.

Claim 13

A navigation apparatus which draws and displays a map on the basis of stored map data, said apparatus comprising: a map data memory which stores the map data; a first processor which outputs map data read out from said map data memory, drawing attribute data for drawing the map, and scroll attribute data for scrolling the map; and a second processor which receives the outputted map data, drawing attribute data, and scroll attribute data, and performs a map drawing process and a map scroll process on the basis of the received data.

Claim 14

A navigation apparatus which draws and displays a map on the basis of stored map data, said apparatus comprising: a map data memory which stores the map data; a first processor which outputs map data read out from said map data memory, drawing attribute data for drawing the map, and scroll attribute data for scrolling the map; and a second processor which receives the outputted map data, drawing attribute data, and scroll attribute data, and performs a map drawing process and a map scroll process on the basis of the received data.

Claim 15

A navigation apparatus according to claim 11, wherein the drawing attribute data include present position information for specifying a present position, map size information for specifying a size of the map to be drawn, and information of a map which is to be drawn at a future time, and the scroll attribute data include screen display position information having information of a start position of a scroll, a direction of the scroll, and an amount of the scroll.

Claim 16

A navigation apparatus according to claim 11, wherein said apparatus further comprises a serial communication line through which the map data, the drawing attribute data, and the scroll attribute data are transmitted from said first processor to said second processor.