參數(shù)資料
型號(hào): PSD834F2
英文描述: Flash In-System Programmable (ISP) Peripherals For 8-bit MCUs(用于8位MCUs的閃速ISP外圍)
中文描述: Flash在系統(tǒng)可編程(ISP)為周邊8位微控制器(用于8位微控制器的閃速的ISP外圍)
文件頁(yè)數(shù): 53/98頁(yè)
文件大小: 595K
代理商: PSD834F2
53/98
PSD8XXF2/3/4/5
Figure 27. Port D Structure
Port D – Functionality and Structure
Port D has three I/O pins. See Figure 27 and Fig-
ure 28. This port does not support Address Out
mode, and therefore no Control Register is re-
quired. PortD can beconfigured toperform one or
more of the following functions:
I
MCU I/O Mode
I
CPLD Output – External Chip Select (ECS0-
ECS2)
I
CPLD Input – direct input to the CPLD, no Input
Macrocells (IMC)
I
Slew rate – pins can be set up for fast slew rate
Port D pins can be configured in PSDsoft Express
as input pins for other dedicated functions:
I
Address Strobe (ALE/AS, PD0)
I
CLKIN (PD1) as input to the macrocells flip-
flops and APD counter
I
PSD Chip Select Input (CSI, PD2). Driving this
signal High disables the Flash memory, SRAM
and CSIOP.
External Chip Select
The CPLD also provides three External Chip Se-
lect (ECS0-ECS2) outputs on Port D pins that can
be used to select external devices. Each External
Chip Select (ECS0-ECS2) consists of one product
term that can be configured active High or Low.
The output enable of the pin iscontrolled by either
the output enable product term or the Direction
Register. (See Figure 28.)
I
DATA
OUT
REG.
D
Q
D
Q
WR
WR
ECS[2:0
]
READ MUX
P
D
B
CPLD-INPUT
DIR REG.
DATA IN
ENABLE PRODUCT
TERM (.OE)
OUTPUT
SELECT
OUTPUT
MUX
PORT D PIN
DATA OUT
AI02889
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PSD834F2-15M 制造商:STMicroelectronics 功能描述:Flash In-System Programmable Peripherals 52-Pin PQFP
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