90
µ
PD17062
10.2 FUNCTIONS OF DATA BUFFER
The data buffer provides the following two functions:
(1) Read constant data in program memory (to reference tables)
(2) Transfer data to and from peripheral hardware
Fig. 10-3 shows the relationship between the data buffer, peripheral hardware, and memory.
Table referencing is described in
Section 10.3
, and the peripheral hardware is described in
Sections 10.4
to
10.6
.
Fig. 10-3 Relationship Between Data Buffer, Peripheral Hardware, and Memory
01H
02H
03H
04H
05H-08H
40H
41H
Peripheral address
Data buffer
Internal
Table referencing
Peripheral hardware
Image display controller (IDC)
A/D converter
Serial interface
Horizontal synchronizing signal
counter
6-bit D/A converter
Address register (AR)
PLL frequency synthesizer
Program memory
(ROM)
Constant data