参数资料
型号: M306H2MC-XXXFP
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP116
封装: 20 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-116
文件页数: 19/32页
文件大小: 2643K
代理商: M306H2MC-XXXFP
26
Rev. 1.0
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
with DATA ACQUISITION CONTROLLER
MITSUBISHI MICROCOMPUTERS
M306H2MC-XXXFP
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Table 2.4.5 Operation of RD, WR, and BHE signals
Status of external data bus
RD
BHE
WR
HL
L
LHL
HLH
LH
H
Write 1 byte of data to odd address
Read 1 byte of data from odd address
Write 1 byte of data to even address
Read 1 byte of data from even address
Data bus width
A0
H
L
HL
L
LHL
L
HL
H / L
LH
H / L
8-bit
(BYTE = “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 = “L”)
Not used
Status of external data bus
Read data
Write 1 byte of data to even address
Write 1 byte of data to odd address
Write data to both even and odd addresses
WRH
WRL
RD
Data bus width
16-bit
(BYTE = “L”)
H
L
H
L
H
L
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Table 2.4.4 Operation of RD, WRL, and WRH signals
(3) Read/write signals
With a 16-bit data bus (BYTE pin =“L”), bit 2 of the processor mode register 0 (address 000416) select
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the combinations of RD, BHE, and WR signals or RD, WRL, and WRH signals. With an 8-bit data bus
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(BYTE pin = “H”), use the combination of RD, WR, and BHE signals. (Set bit 2 of the processor mode
register 0 (address 000416) to “0”.) Tables 2.4.4 and 2.4.5 show the operation of these signals.
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After a reset has been cancelled, the combination of RD, WR, and BHE signals is automatically selected.
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When switching to the RD, WRL, and WRH combination, do not write to external memory until bit 2 of
the processor mode register 0 (address 000416) has been set (Note).
Note: Before attempting to change the contents of the processor mode register 0, set bit 1 of the
protect register (address 000A16) to “1”.
(4) ALE signal
The ALE signal latches the address when accessing the multiplex bus space. Latch the address when
the ALE signal falls.
Figure 2.4.4 ALE signal and address/data bus
When BYTE pin = “H”
When BYTE pin = “L”
ALE
Address
Data (Notes 1)
Address (Notes 2)
D0/A0 to D7/A7
A8 to A19
ALE
Address
Data (Notes 1)
Address
D0/A1 to D7/A8
A9 to A19
Address
A0
Notes 1: Floating when reading
Notes 2: When multiplexed bus for the entire space is selected,these are I/O ports.
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