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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
Data buffer
Internal
Program memory
(ROM)
Constant data
90
Peripheral address
Table referencing
Peripheral hardware
Image display controller (IDC)
01H
A/D converter
02H
Serial interface
03H
Horizontal synchronizing signal
04H
counter
6-bit D/A converter
05H-08H
Address register (AR)
40H
PLL frequency synthesizer
41H
PD17062
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