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PSD834210MIT 数据表(PDF) 25 Page - STMicroelectronics

部件名 PSD834210MIT
功能描述  Flash PSD, 3.3V Supply, for 8-bit MCUs 2 Mbit 256 Kbit Dual Flash Memories and 64 Kbit SRAM
PDF  89 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PSD834210MIT 数据表(HTML) 25 Page - STMicroelectronics

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PSD834F2V
Configuration Modes for MCUs with Separate
Program and Data Spaces. Separate
Space
Modes. Program space is separated from Data
space. For example, Program Select Enable
(PSEN, CNTL2) is used to access the program
code from the primary Flash memory, while Read
Strobe (RD, CNTL1) is used to access data from
the secondary Flash memory, SRAM and I/O Port
blocks. This configuration requires the VM register
to be set to 0Ch (see Figure 7).
Figure 7. 8031 Memory Modules – Separate Space
Combined Space Modes. The
Program
and
Data spaces are combined into one memory
space that allows the primary Flash memory, sec-
ondary Flash memory, and SRAM to be accessed
by either Program Select Enable (PSEN, CNTL2)
or Read Strobe (RD, CNTL1). For example, to
configure the primary Flash memory in Combined
space, bits b2 and b4 of the VM register are set to
1 (see Figure 8).
Figure 8. 8031 Memory Modules – Combined Space
Primary
Flash
Memory
DPLD
Secondary
Flash
Memory
SRAM
RS0
CSBOOT0-3
FS0-FS7
CS
CS
CS
OE
OE
RD
PSEN
OE
AI02869C
Primary
Flash
Memory
DPLD
Secondary
Flash
Memory
SRAM
RS0
CSBOOT0-3
FS0-FS7
RD
CS
CS
CS
RD
OE
OE
VM REG BIT 2
PSEN
VM REG BIT 0
VM REG BIT 1
VM REG BIT 3
VM REG BIT 4
OE
AI02870C



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