- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄371305 > XA-H4 (NXP Semiconductors N.V.) Single-chip 16-bit microcontroller PDF資料下載
參數(shù)資料
| 型號： | XA-H4 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Single-chip 16-bit microcontroller |
| 中文描述： | 單片16位微控制器 |
| 文件頁數(shù)： | 35/42頁 |
| 文件大?。?/td> | 225K |
| 代理商： | XA-H4 |
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頁當(dāng)前第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁
Philips Semiconductors
Preliminary specification
XA-H4
Single-chip 16-bit microcontroller
1999 Sep 24
35
SU01283
t
DIH
D7 – D0
OE
BLE
CS
A19 – A1
ClkOut
t
AVSL
t
CHAV
t
AHDR
Note 2
t
CHSH
t
CHSL
t
OHDE
On all cycles on 8-bit bus, BHE remains high (inactive)
Note:
On the external bus, ALL XA-H4 reads are 16-bit reads. If the CPU instruction only specifies 8-bits, then the CPU uses the appropriate byte, and discards the
extra byte. Thus, “8-Bit Reads” and “16-Bit Reads” appear to be identical on the bus. On an 8-bit bus, this will appear as two consecutive 8-bit reads even
though the CPU will only use one of the two bytes.
WARNING:
Some 8-bit I/O devices (especially FIFOS) cannot operate correctly with 2 bytes being read for a one byte read. The most common (and least expensive)
solution is to operate these 8-bit devices on a 16-bit bus, and access them in software on all odd byte (or all even byte) boundaries. An added benefit of this tech-
nique is that byte reads are faster than on an 8-bit bus, because only 1 word is fetched (a single read) instead of 2 consecutive bytes.
A0
t
DIS
t
DIS
Note 2
Note 3
Driven by XA
Driven by XA
Figure 14. Generic (SRAM, Flash, I/O Device, etc.) Read (16-Bit or 8-Bit) on 8-Bit Bus
Clkout
OE, BLE, CS
D[7:0]
t
CHAV
SU01245
t
CHAV
t
CHAV
t
CHAV
Even Address
Address + 1
LS Byte
t
DIH
Note 2
t
CHSH
t
DIS
Address + 2
Address + 3
t
CHAV
Note 3
MS Byte
LS Byte
MS Byte
t
DIS
t
DIS
t
DIS
t
DIH
Note 2
t
DIH
Note 2
t
DIH
Note 2
Note:
BHE remains high (inactive) for all accesses on an 8-bit bus. A burst code fetch can be
from 1 to 8 words (1 word = 2 bytes), a 2 word fetch is shown here.
Figure 15. Burst Code Fetch on 8-Bit Bus, Generic Memory
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XACA04SPEC0304 | CONTROL STATION 4WAY |
| XACA06SPEC0305 | CONTROL STATION 6WAY |
| XACA215 | FERNSTEUEREINHEIT |
| XALB222 | WIPPSCHALTER ZB2 STEUERGEHAEUSE TASTEN 2 |
| XAITD-100 | Delay Line |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XAI.50V2200 | 制造商:Xicon Passive Components 功能描述: |
| XAIR1-3402-101B | 制造商:Advantech Co Ltd 功能描述:CARRIER BOARD, AIR PRODUCTS 3402-101B3 - Bulk |
| XAIR1-3402-CARTON | 制造商:Advantech Co Ltd 功能描述:D-AIR01-SOM7562-01 - OUTER CARTON - Bulk |
| XAITD-100 | 制造商:RHOMBUS-IND 制造商全稱:Rhombus Industries Inc. 功能描述:XAITD Series FAST / TTL Buffered 10-Tap Delay Modules |
| XAITD-100G | 制造商:RHOMBUS-IND 制造商全稱:Rhombus Industries Inc. 功能描述:XAITD Series FAST / TTL Buffered 10-Tap Delay Modules |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。