HD6412340 HITACHI [Hitachi Semiconductor], HD6412340 Datasheet - Page 338
HD6412340
Manufacturer Part Number
HD6412340
Description
H8S/2345 F-ZTAT Hardware Manual
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6412340.pdf
(907 pages)
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9.3
9.3.1
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 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 9.2.
9.3.2
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 9.3, 9.4, and 9.5.
Bus
master
Bus
master
Figure 9.3 8-Bit Register Access Operation [Bus Master
Figure 9.2 16-Bit Register Access Operation [Bus Master
Interface to Bus Master
16-Bit Registers
8-Bit Registers
Internal data bus
Internal data bus
H
L
H
L
Bus interface
Bus interface
TCNTH
TCR
TCR (Upper 8 Bits)]
TCNTL
TCNT (16 Bits)]
Module
data bus
Module
data bus
321
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