參數(shù)資料
型號(hào)： M38K29F8LFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封裝： 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù)： 118/151頁
文件大?。?/td> 1403K
代理商： M38K29F8LFP
38K2 Group
Rev.3.00
Oct 15, 2006
page 69 of 147
REJ03B0193-0300
EXTERNAL BUS INTERFACE (EXB)
The external bus interface (EXB) controls the data transfer be-
tween the external MCU and the 38K2 group’s CPU or its
qCPU channel
It is a data transfer course by the interrupt processing between the
external MCU and the 38K2 group’s CPU.
qMemory channel
It is a data transfer course by direct RAM access of the memory
channel controller between the external MCU and the 38K2
group’s memory (multichannel RAM)
CPU channel
[Interrupt type]
Memory channel
[Direct RAM access type]
38K2 group
USB bus
(USB host)
Exter
nal
MCU
CPU
Program ROM
Peripheral functions
External bus interface
(EXB)
USB
Multichannel RAM
Fig. 103 External bus interface
Address
CS, RD, WR,
DMA acknowledge
Access cycle time from externals:
3 clocks or more of
φ + Signal delay time + Data setup
time of external MCU in USB inactive
5 clocks or more of
φ + Signal delay time + Data setup
time of external MCU in USB active
Fig. 104 Data transfer timing of memory channel
memory (multichannel RAM). The external bus interface is shown
below.
qData transfer of memory channel
When the burst mode is selected with the burst bit of the memory
channel operation mode register, data transfer can be carried out
at the highest speed. After the external bus interface detects a rise
of external read signal/write signal and synchronizes it with the in-
ternal clock
φ, it completes the data transfer between the transmit/
receive buffer and the multichannel RAM in two clocks.
However, the waiting time of two clocks at a maximum is gener-
ated to access the multichannel RAM in USB being operating
because the USB has priority to access.
Therefore, it is necessary to set up the access interval which fills
the following timing with the external MCU bus side.
In
φ = 8 MHz, data transfer at about 2 Mbytes/second is possible
at a maximum. When there is access simultaneously from the
USB, it is about 1.3 Mbytes/second.
In
φ = 6 MHz, data transfer at about 1.5 Mbytes/second is possible
at a maximum. When there is access simultaneously from the
USB, it is about 1 Mbytes/second.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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M38K29T-PAC 制造商:Renesas Electronics Corporation 功能描述:DEV SIMPLE TOOL SYSTEM PKG FOR 38000/38K - Bulk
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