參數(shù)資料
型號(hào): PSD935F3V-15MI
廠商: 意法半導(dǎo)體
英文描述: Configurable Memory System on a Chip for 8-Bit Microcontrollers
中文描述: 在8片位微控制器可配置存儲(chǔ)系統(tǒng)
文件頁數(shù): 54/91頁
文件大?。?/td> 488K
代理商: PSD935F3V-15MI
PSD935G2
PSD9XX Family
53
The
PSD935G2
Functional
Blocks
(cont.)
9.4.6 Port D – Functionality and Structure
Port D has four I/O pins. See Figure 22. Port D can be configured to program one or more
of the following functions:
J
MCU I/O Mode
J
PLD Input – direct input to PLD
Port D pins can be configured in PSDsoft as input pins for other dedicated functions:
J
PD0 – ALE, as address strobe input
J
PD1 – CLKIN, as clock input to the PLD and APD counter
J
PD2 – CSI, as active low chip select input. A high input will disable the
Flash/SRAM and CSIOP.
J
PD3 – DBE input from 68HC912
9.4.7 Port E – Functionality and Structure
Port E can be configured to perform one or more of the following functions (see Figure 23):
J
MCU I/O Mode
J
In-System Programming – JTAG port can be enabled for programming/erase of the
PSD935G2 device. (See Section 9.6 for more information on JTAG programming.)
Pins that are configured as JTAG pins in PSDsoft will not be available for other I/O
functions.
J
Open Drain – Port E pins can be configured in Open Drain Mode
J
Battery Backup features – PE6 can be configured as a Battery Input (Vstby) pin.
PE7 can be configured as a Battery On Indicator output
pin, indicating when Vcc is less than Vbat.
J
Latched Address Output – Provided latched address (A7-0) output
I
DATA OUT
REG.
D
Q
D
Q
WR
WR
READ MUX
P
D
B
PLD INPUT
DIR REG.
DATA IN
OUTPUT
SELECT
OUTPUT
MUX
PORT D PIN
DATA OUT
Figure 22. Port D Structure
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