- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98007 > M44C588 (TEMIC SEMICONDUCTORS) 4-BIT, MROM, 4 MHz, MICROCONTROLLER PDF資料下載
參數(shù)資料
| 型號： | M44C588 |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 4 MHz, MICROCONTROLLER |
| 文件頁數(shù)： | 13/44頁 |
| 文件大?。?/td> | 549K |
| 代理商： | M44C588 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁當前第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁
M44C588
TELEFUNKEN Semiconductors
Rev. A1, 11-Nov-97
Preliminary Information
20 (44)
There are four different types of bidirectional ports:
D Type 1 (Ports 0 and 1) – 4-bit wide bidirectional ports
with automatic full bus width direction switching.
D Type 2 (Port B) – 4-bit wide bitwise programmable
bidirectional port with static pull-ups/ -downs.
D Type 3 (Port 6) – 4-bit wide bitwise programmable
bidirectional port with static pull-ups/ -downs and
versatile interrupt control logic.
D Type 4 (Port 4) – 4-bit wide bitwise programmable
bidirectional port also provides the I/O interface for
Timer 0 and Timer 1.
2.2.1
Bidirectional Port 0 and Port 1
In this port type, the data direction register is not indepen-
dently software programmable, the direction of the
complete port being switched automatically when an I/O
instruction occurs (see figure 18). The port is switched to
output mode with an OUT instruction and to input with an
IN instruction. The data written to a port will be stored
into the output data latches and appears immediately at
the port pin following the OUT instruction. After RESET
all output latches are set to ’1’ and the ports are switched
to input mode. An IN instruction reads the condition of
the associated pins.
Note
Care must be taken when switching these bidirectional
ports from output to input. The capacitive pin loading at
this port in conjunction with the high resistance pull-up
may cause the CPU to read the contents of the output data
register rather than the external input state. To avoid this,
one should use either of the following programming tech-
niques:
D Use two IN instructions and DROP the first data
nibble. The first IN switches the port from output to
input and the DROP removes the first invalid nibble.
The second IN reads the valid pin state.
D Use an OUT instruction followed by an IN instruction.
With the OUT instruction the capacitive load is
charged or discharged depending on the optional
pull-up /pull-down configuration. Write a “1” for pins
with pull-up resistors and a “0” for pins with pull-
down resistors.
OUT
IN
Reset
I/O Bus
D
R
S
Q
NQ
R
Master reset
PxDATy
*) Mask options
(Data out)
(Direction)
Port 1 only
BPxy
V
DD
*
Pull-up
*
Pull-down
*
V
DD
*
96 11523
Figure 18. Bidirectional Ports 0 and 1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M44C892 | 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20 |
| M48T08Y-15PC1 | 0 TIMER(S), REAL TIME CLOCK, PDMA28 |
| M48T08Y-10PC1 | 0 TIMER(S), REAL TIME CLOCK, PDMA28 |
| M48T128Y-70PM1 | 0 TIMER(S), REAL TIME CLOCK, PDIP32 |
| M48T128Y-85PM1 | 0 TIMER(S), REAL TIME CLOCK, PDIP32 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M44C890 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Low-Current Microcontroller for Wireless Communication |
| M44C890-H | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Low-Current Microcontroller for Wireless Communication |
| M44S05K4F1 | 功能描述:汽車連接器 MX44 Terminals RoHS:否 制造商:Amphenol SINE Systems 產(chǎn)品:Contacts 系列:ATP 位置數(shù)量: 型式:Female 安裝風格: 端接類型: 觸點電鍍:Nickel |
| M44T332538880MHZ | 制造商:MEC 功能描述: |
| M44T3338880MHZ | 制造商:MEC 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復。