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Table 4-1 Access and Data Bus Used
Word Access
Byte Access
Even Address Odd Address
Even Address Odd Address
ROM space
Upper 8 bits
Lower 8 bits
Upper 8 bits
Upper 8 bits
RAM space
Upper 8 bits
Lower 8 bits
Upper 8 bits
Upper 8 bits
I/O register with 8-bit data bus
width
Upper 8 bits
Upper 8 bits
Upper 8 bits
Upper 8 bits
I/O register with 16-bit data
bus width
Upper 8 bits
Lower 8 bits
—
—
4.1.2
Address Break Status Register(ABRKSR)
ABRKSR consists of the address break interrupt flag and the address break interrupt enable bit.
Bit
Bit Name
Initial Value
R/W
Description
7
ABIF
0
R/W
Address Break Interrupt Flag
[Setting condition]
When the condition set in ABRKCR is satisfied
[Clearing condition]
When 0 is written after ABIF=1 is read
6
ABIE
0
R/W
Address Break Interrupt Enable
When this bit is 1, an address break interrupt request is
enabled.
5
4
3
2
1
0
−
−
−
−
−
−
0
0
0
0
0
0
−
−
−
−
−
−
Reserved
These bits are always read as 1 and cannot be modified.
4.1.3
Break Address Registers (BARH, BARL)
BARH, BARL are 16-bit read/write registers that set the address for generating an address break
interrupt. When setting the address break condition to the instruction execution cycle, set the first
byte address of the instruction. The initial value of this register is H'FFFF.
Содержание H8/3670F-ZTAT HD64F3670
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