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參數(shù)資料
| 型號(hào)： | XA-H3 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | CMOS 16-bit highly integrated microcontroller |
| 中文描述： | 的CMOS 16位高度集成的微控制器 |
| 文件頁數(shù)： | 31/36頁 |
| 文件大小： | 183K |
| 代理商： | XA-H3 |
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Philips Semiconductors
Preliminary specification
XA-H3
CMOS 16-bit highly integrated microcontroller
1999 Sep 24
31
SU01278
t
SHAH
t
CHDV
Note 1
t
CHSL
t
CHSH
D
WE
BHE/BLE
CS
A
t
CHAV
ClkOut
t
SHDH
t
AVSL
Figure 9. Write ( byte write on 8-bit bus, or all writes on 16-bit bus )
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 10. Read (16-Bit or 8-Bit) on 8 Bit Bus
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XA-H4 | Single-chip 16-bit microcontroller |
| XACA04SPEC0304 | CONTROL STATION 4WAY |
| XACA06SPEC0305 | CONTROL STATION 6WAY |
| XACA215 | FERNSTEUEREINHEIT |
| XALB222 | WIPPSCHALTER ZB2 STEUERGEHAEUSE TASTEN 2 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XA-H4 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single-chip 16-bit microcontroller |
| 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 |
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