Rev. 3.0, 10/02, page 291 of 686
10.4
Interface to Bus Master
10.4.1
16-Bit Registers
TCNT and TGR are 16-bit registers. As the data bus to the bus master is 16 bits wide, these
registers can be read and written to in 16-bit units.
These registers cannot be read from or written to in 8-bit units; 16-bit access must always be used.
An example of 16-bit register access operation is shown in figure 10.2.
H
L
TCNTH
TCNTL
Internal data bus
Bus interface
Module
data bus
Bus
master
Figure 10.2 16-Bit Register Access Operation [Bus Master
↔
↔
↔
↔
TCNT (16 Bits)]
10.4.2
8-Bit Registers
Registers other than TCNT and TGR are 8-bit. As the data bus to the CPU is 16 bits wide, these
registers can be read and written to in 16-bit units. They can also be read and written to in 8-bit
units.
Examples of 8-bit register access operation are shown in figures 10.3 to 10.5.
H
L
TCR
Internal data bus
Bus interface
Module
data bus
Bus
master
Figure 10.3 8-Bit Register Access Operation [Bus Master
↔
↔
↔
↔
TCR (Upper 8 Bits)]
Содержание H8S/2215 Series
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Страница 721: ...Rev 3 0 10 02 page 663 of 686 ø A23 to A0 to tBRQS tBACD tBZD tBACD tBZD tBRQS Figure 24 11 External Bus Release Timing ...
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