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參數(shù)資料
| 型號： | W65C134S8PL-8 |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 36/60頁 |
| 文件大小： | 711K |
| 代理商： | W65C134S8PL-8 |
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WESTERN DESIGN CENTER
2.5
Bus Enable and RDY Input (BE)
W65C134S
March 1, 2000
31
2.5.1
BE controls the address bus, data bus and WEB signals. When RESB goes high signaling the
power-up condition, the processor starts; and if BE was low when RESB went from low to high,
then the Bus Control Register (BCR) bits 0, 3, and 7 (BCR0, BCR3, and BCR7) are set to 1
(emulation mode).
After RESB goes high BE controls the direction of the address bus (A0-A7, A8-A15), data bus
(D0-D7) and WEB.
When BE goes low during PHI2 low time, the address bus and WEB are inputs, providing for
DMA (direct memory and I/O access) for emulation purposes. Data from D0-D7 is written to
any register addressed by A0-A15 when WEB is low. Data is read from D0-D7 when WEB is
high. The W65C02S is stopped when BE is low.
When BE is high, the A0-A15, D0-D7 and WEB are controlled by the on-chip microprocessor.
When BE is pulled low during PHI2 high time, BE does not affect the direction of the address,
data BUS and WEB signals. When BE is pulled low in PHI2 high time, the W65C02S is stopped
so that the processor may be single stepped in emulation.
2.5.2
2.5.3
2.5.4
2.5.5
BE = BE . (RDY + PHI2B) (This logic is on the ICE to provide the emulation interface normally used for
W65C02S systems.)
Notes:
1)
Address and WEB are inputs with data bus input except when reading on-chip I/O registers or
memory. Use this mode for DMA.
W65C02S stopped with RDY function of BE pin. When BCR3=1, the W65C02S read or write
of internal I/O register or memory is output on the external data bus so that the internal data bus
may be traced in emulation.
2)
Figure 2-3 BE Timing Relative to PHI2
相關(guān)PDF資料 |
PDF描述 |
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| W65C134S8Q-8 | 8-BIT MICROCONTROLLER |
| W65C134SPL-8 | 8-BIT MICROCONTROLLER |
| W65C134SQ-8 | 8-BIT MICROCONTROLLER |
| W65C29P-6 | I/O Controller |
| W65C29P-8 | I/O Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W65C134S8PLG-14 | 制造商:Western Design Center (WDC) 功能描述:8-bit Microcontrollers - MCU 8-bit Microcontroller |
| W65C134S8PLG-8 | 功能描述:8位微控制器 -MCU 8-bit Microcontroller RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| W65C134S8Q-8 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W65C134SPL-8 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W65C134SQ-8 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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