PSD813F1A-12J STMICROELECTRONICS [STMicroelectronics], PSD813F1A-12J Datasheet - Page 33
PSD813F1A-12J
Manufacturer Part Number
PSD813F1A-12J
Description
Flash In-System Programmable (ISP) Peripherals for 8-bit MCUs, 5V
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.PSD813F1A-12J.pdf
(110 pages)
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PAGE REGISTER
The 8-bit Page Register increases the addressing
capability of the microcontroller by a factor of up to
256. The contents of the register can also be read
by the microcontroller. The outputs of the Page
Register (PGR0-PGR7) are inputs to the DPLD
decoder and can be included in the Flash Memory,
EEPROM, and SRAM chip select equations.
If memory paging is not needed, or if not all 8 page
register bits are needed for memory paging, then
these bits may be used in the CPLD for general
logic.
Figure 14. Page Register
RESET
R / W
D 0 - D 7
D 0
D 1
D 2
D 3
D 4
D 5
D 6
D 7
REGISTER
PAGE
Q 0
Q 1
Q 2
Q 3
Q 4
Q 5
Q 6
Q 7
PGR0
PGR1
PGR2
PGR3
PGR4
PGR5
PGR6
PGR7
Figure
flops in the register are connected to the internal
data bus D0-D7. The microcontroller can write to
or read from the Page Register. The Page Regis-
ter can be accessed at address location CSIOP +
E0h.
14
Flash DPLD
Flash CPLD
shows the Page Register. The eight flip
AND
PLD
INTERNAL
SELECTS
AND LOGIC
PSD813F1
AI09224
33/110
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