参数资料
型号: M38K29F8LHP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封装: 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64
文件页数: 7/126页
文件大小: 2167K
代理商: M38K29F8LHP
1-85
38K2 Group User’s Manual
HARDWARE
FUNCTIONAL DESCRIPTION
(4) Memory Channel Receiving Operation (2)-
Burst Mode
Memory channel receiving operation (2) is shown bellow.
Fig. 125 Memory channel receiving operation (2)
Dack =
“0”
Dack =
“0”
Dack =
“0”
#0
#1
#2
Mch_req
#0
#1
#2
012
3
5
req
010016
010116
010216
010316
ack
DMA acknowledge
ExDACK
mWR
detection
mWR
detection
DMA request
ExDREQ
Address ExA0
Chip select ExCS
Read ExRD
Write ExWR
Data DQ0 to DQ7
Internal clock
φ
Operation enabled
Main sequencer
Internal memory access
Acknowledgment of
internal memory access
Memory address
Counter end
Burst end
Memory channel operation
end interrupt
A0 = “x”
CS = “1”
A0 = “x”
CS = “1”
A0 = “x”
CS = “1”
<Initial setting>
External I/O configuration register
Set as necessary.
Memory channel operation mode register
MC_DIR[1:0] (Memory channel direction control) = 012 (Receive mode)
Burst (burst) = “1” (Burst mode)
Memory address counter
(Example) 010016
End address register
(Example) 010216
<Operation start command>
EXB interrupt source enable register
MC_ENB (Memory channel operation enable) = “1” (Operation start)
In the memory channel receive mode when the command for enabling operation is written, assertion of the memory channel request which synchronized
with a rise of
φ is made.
When a rise of ExWR is detected, an internal memory access sequence which synchronized with a rise of φ is activated and a data is written in the internal
memory within two clocks at a minimum.
The memory address counter is increased simultaneously at the former data write completion.
When the memory address counter reaches the end address, the detection circuit of external write signal (ExWR) operation is enabled and negation of the
memory channel request which synchronized with the following
φ is made.
When the write operation to the end address has been completed, the memory address counter is increased and the memory channel operation end
interrupt is generated.
Receive buffer RXBUF
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