HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 509
HD6412332
Manufacturer Part Number
HD6412332
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412332.pdf
(1244 pages)
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10.3
10.3.1
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 10.2.
10.3.2
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 10.3 to 10.5.
Bus
master
Figure 10.2 16-Bit Register Access Operation [Bus Master ↔ TCNT (16 Bits)]
Interface to Bus Master
16-Bit Registers
8-Bit Registers
Internal data bus
H
L
Bus interface
TCNTH
Rev.4.00 Sep. 07, 2007 Page 479 of 1210
TCNTL
REJ09B0245-0400
Module
data bus
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