參數(shù)資料
型號： PSD4256G6V-10UIT
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 1M X 8 FLASH, 52 I/O, PIA-GENERAL PURPOSE, PQFP80
封裝： PLASTIC, TQFP-80
文件頁數(shù)： 107/127頁
文件大小： 1091K
代理商： PSD4256G6V-10UIT
I/O ports
PSD4256G6V
19.2
Port operating modes
The I/O ports have several modes of operation. Some modes can be defined using PSDsoft,
some by the MCU writing to the registers in CSIOP space, and some by both. The modes
that can only be defined using PSDsoft must be programmed into the device and cannot be
changed unless the device is reprogrammed. The modes that can be changed by the MCU
can be done so dynamically at run-time. The PLD I/O, Data Port, Address Input, Peripheral
I/O and MCU RESET modes are the only modes that must be defined before programming
the device. All other modes can be changed by the MCU at run-time. See application note
AN1171 for more detail.
Table 41 summarizes which modes are available on each port. Table 42 shows how and
where the different modes are configured. Each of the port operating modes are described
in the following sections.
Figure 31.
General I/O port architecture
INTERNAL
DATA
BUS
DATA OUT
REG.
DQ
D
G
Q
DQ
WR
ADDRESS
MACROCELL OUTPUTS
ENABLE PRODUCT TERM (.OE)
EXT CS
ALE
READ MUX
P
D
B
CPLD - INPUT
CONTROL REG.
DIR REG.
INPUT
MACROCELL
ENABLE OUT
DATA IN
OUTPUT
SELECT
OUTPUT
MUX
PORT PIN
DATA OUT
ADDRESS
AI02885
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