參數(shù)資料
型號: PSD4235G2-90UT
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 256K X 16 FLASH, 52 I/O, PIA-GENERAL PURPOSE, PQFP80
封裝: PLASTIC, TQFP-80
文件頁數(shù): 32/100頁
文件大?。?/td> 933K
代理商: PSD4235G2-90UT
37/100
PSD4235G2
PAGE REGISTER
The 8-bit Page Register increases the addressing
capability of the MCU by a factor of up to 256. The
contents of the register can also be read by the
MCU. The outputs of the Page Register (PGR0-
PGR7) are inputs to the DPLD decoder and can be
included
in
the
Sector
Select
(FS0-FS7,
CSBOOT0-CSBOOT3), and SRAM Select (RS0)
equations.
If memory paging is not needed, or if not all eight
page register bits are needed for memory paging,
these bits may be used in the CPLD for general
logic. See Application Note AN1154.
Table 22 and Figure 11 show the Page Register.
The eight flip-flops in the register are connected to
the internal data bus (D0-D7). The MCU can write
to or read from the Page Register. The Page Reg-
ister can be accessed at address location CSIOP
+ E0h.
Figure 11. Page Register
MEMORY ID REGISTERS
The 8-bit Read-only Memory Status Registers are
included in the CSIOP space. The user can deter-
mine the memory configuration of the PSD device
by reading the Memory ID0 and Memory ID1 reg-
isters. The content of the registers is defined as
shown in Table 26 and Table 27.
RESET
D0 - D 7
R/W
D0
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
D1
D2
D3
D4
D5
D6
D7
PAGE
REGISTER
PGR0
PGR1
PGR2
PGR3
DPLD
AND
CPLD
INTERNAL
SELECTS
AND LOGIC
PLD
PGR4
PGR5
PGR6
PGR7
AI02871B
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