參數(shù)資料
型號： M306H3MC-XXXFP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP116
封裝： 20 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-116
文件頁數(shù)： 61/135頁
文件大?。?/td> 2583K
代理商： M306H3MC-XXXFP
Rev.1.00
2004.03.23
page 31 of 320
M306H3MC-XXXFP/FCFP
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______
________
Table 2.4.6. Operation of RD, WR and BHE Signals
Status of external data bus
RD
BHE
WR
H
L
H
L
H
L
H
L
H
Write 1 byte of data to an odd address
Read 1 byte of data from an odd address
Write 1 byte of data to an even address
Read 1 byte of data from an even address
Data bus width
A0
H
L
H
L
H
L
H
L
H or L
L
H
H or L
8-bit (BYTE pin
input = “H”)
Write data to both even and odd addresses
Read data from both even and odd addresses
Write 1 byte of data
Read 1 byte of data
16-bit
(BYTE pin input
= “L”)
(Note)
Note : Do not use.
Status of external data bus
Read data
Write 1 byte of data to an even address
Write 1 byte of data to an odd address
Write data to both even and odd addresses
WRH
WRL
RD
Data bus width
16-bit
( BYTE pin input
= “L”)
H
L
H
L
H
L
_____
________
_________
Table 2.4.5. Operation of RD, WRL and WRH Signals
(4) Read and Write Signals
_____
When the data bus is 16 bits wide, the read and write signals can be chosen to be a combination of RD,
________
______
_____
________
BHE and WR or a combination of RD, WRL and WRH by using the PM02 bit in the PM0 register. When
_____
______
________
the data bus is 8 bits wide, use a combination of RD, WR and BHE.
_____
________
_________
Table 2.4.5 shows the operation of RD, WRL, and WRH signals. Table 2.4.6 shows the operation of
_____
______
________
operation of RD, WR, and BHE signals.
(5) ALE Signal
The ALE signal latches the address when accessing the multiplex bus space. Latch the address when the
ALE signal falls.
When BYTE pin input = “H”
When BYTE pin input = “L”
ALE
Address
Data
Address (Note)
A0/D0 to A7/D7
A8 to A19
ALE
Address
Data
Address
A1/D0 to A8/D7
A9 to A19
Address
A0
Note : If the entire CS space is assigned a multiplexed bus, these pins function as I/O ports.
Figure 2.4.8. ALE Signal, Address Bus, Data Bus
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