8-Bit Accessible Registers; Figure 8.9 Access To Timer Counter L (Cpu Reads 16Tcntl, Lower Byte); Figure 8.10 16Tcr Access (Cpu Writes To 16Tcr); Figure 8.11 16Tcr Access (Cpu Reads 16Tcr) - Hitachi H8/3062 Hardware Manual

Internal data bus
H
CPU L

Figure 8.9 Access to Timer Counter L (CPU Reads 16TCNTL, Lower Byte)

8.3.2

8-Bit Accessible Registers

The registers other than the timer counters and general registers are 8-bit registers. These registers
are linked to the CPU by an internal 8-bit data bus.
Figures 8.10 and 8.11 show examples of byte read and write access to a 16TCR.
If a word-size data transfer instruction is executed, two byte transfers are performed.
Internal data bus
H
CPU L
Internal data bus
H
CPU L
250
Bus interface
Bus interface

Figure 8.10 16TCR Access (CPU Writes to 16TCR)

Bus interface

Figure 8.11 16TCR Access (CPU Reads 16TCR)

16TCNTH 16TCNTL
16TCR
16TCR
H
Module
L
data bus
H
Module
L
data bus
H
Module
L
data bus