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參數(shù)資料
| 型號： | M37735EHLHP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, OTPROM, MICROCONTROLLER, PQFP80 |
| 封裝： | FINE PITCH, PLASTIC, QFP-80 |
| 文件頁數(shù)： | 48/63頁 |
| 文件大?。?/td> | 8367K |
| 代理商： | M37735EHLHP |
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CENTRAL PROCESSING UNIT (CPU)
7733 Group User’s Manual
2–14
2.2.3 Operation of bus interface unit (BIU)
Figure 2.2.3 shows the basic operating waveforms of the bus interface unit (BIU). When accessing external
devices, some signals which are input or output to or from the external are required. For details about
these signals, refer to chapter “12. CONNECTING EXTERNAL DEVICES.”
(1) When fetching an instruction into an instruction queue buffer
When an instruction which is next fetched resides at an even address
The BIU fetches two bytes of the instruction with waveform (a).
Note that when an external device which is connected by an 8-bit external data bus (BYTE = “H”)
is accessed, only one byte of the instruction is fetched.
When an instruction which is next fetched resides at an odd address
The BIU fetches only one byte of the instruction with waveform (a). The contents at an even
address is not fetched into an instruction queue buffer.
(2) When reading or writing data from or to memory I/O
When accessing 16-bit data which starts from an even address, waveform (a) is applied. The 16-
bit data is accessed at a time.
When accessing 16-bit data which starts from an odd address, waveform (b) is applied. The 16-bit
data is accessed by the 8 bits. Invalid data is not fetched into a data buffer.
When accessing 8-bit data at an even address, waveform (a) is applied. Data at an odd address
is not fetched into a data buffer.
When accessing 8-bit data at an odd address, waveform (a) is applied. Data at an even address
is not fetched into a data buffer.
For instructions which are affected by the data length flag (m) or index register length flag (x), an
operation is applied as follows:
When “m” or “x” = “0,” operation or is applied.
When “m” or “x” = “1,” operation or is applied.
2.2 Bus interface unit
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PDF描述 |
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| M37753M6C-XXXFP | 16-BIT, MROM, 40 MHz, MICROCONTROLLER, PQFP80 |
| M37754M6C-XXXHP | 16-BIT, MROM, 40 MHz, MICROCONTROLLER, PQFP100 |
| M37754M6C-XXXGP | 16-BIT, MROM, 40 MHz, MICROCONTROLLER, PQFP100 |
| M37754M8C-XXXGP | 16-BIT, MROM, 40 MHz, MICROCONTROLLER, PQFP100 |
| M37754S4CGP | 16-BIT, 40 MHz, MICROCONTROLLER, PQFP100 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37735EHLXXXHP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:PROM VERSION OF M37735MHLXXXHP |
| M37735M4B | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M37735M4BXXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M37735M4L | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M37735M4LXXXHP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
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