參數(shù)資料
型號: PSD854F2A-90MT
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 256K X 8 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQFP52
封裝: ROHS COMPLIANT, PLASTIC, QFP-52
文件頁數(shù): 102/128頁
文件大?。?/td> 1045K
代理商: PSD854F2A-90MT
PSD8XXFX
I/O ports
Doc ID 7833 Rev 7
16.19
Enable Out
The Enable Out register can be read by the MCU. It contains the output enable values for a
given port. A 1 indicates the driver is in output mode. A 0 indicates the driver is in tri-state
and the pin is in input mode.
16.20
Ports A and B – functionality and structure
Ports A and B have similar functionality and structure, as shown in Figure 27. The two ports
can be configured to perform one or more of the following functions:
MCU I/O mode
CPLD Output – macrocells McellAB7-McellAB0 can be connected to port A or port B.
McellBC7-McellBC0 can be connected to port B or port C.
CPLD input – Via the input macrocells (IMC).
Latched Address output – Provide latched address output as per Table 22.
Address In – Additional high address inputs using the input macrocells (IMC).
Open Drain/Slew Rate – pins PA3-PA0 and PB3-PB0 can be configured to fast slew
rate, pins PA7-PA4 and PB7-PB4 can be configured to Open Drain mode.
Data port – port A to D7-D0 for 8 bit non-multiplexed bus
Multiplexed Address/Data port for certain types of MCU bus interfaces.
Peripheral mode – port A only
Figure 27.
Port A and port B structure
INTERNAL
DATA
BUS
DATA OUT
REG.
DQ
D
G
Q
DQ
WR
ADDRESS
MACROCELL OUTPUTS
ENABLE PRODUCT TERM (.OE)
ALE
READ MUX
P
D
B
CPLD - INPUT
CONTROL REG.
DIR REG.
INPUT
MACROCELL
ENABLE OUT
DATA IN
OUTPUT
SELECT
OUTPUT
MUX
PORT
A OR B PIN
DATA OUT
ADDRESS
A[ 7:0] OR A[15:8]
AI02887
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