HD6413007F20 Datasheet, PDF (396/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

10. 8-Bit Timers
10.3 CPU Interface
10.3.1 8-Bit Registers
8TCNT, TCORA, TCORB, 8TCR, and 8TCSR are 8-bit registers. These registers are connected to
the CPU by an internal 16-bit data bus and can be read and written a word at a time or a byte at a
time.
Figures 10.2 and 10.3 show the operation in word read and write accesses to 8TCNT.
Figures 10.4 to 10.7 show the operation in byte read and write accesses to 8TCNT0 and 8TCNT1.
Internal data bus
H
C
PL
U
Bus
interface
H
L ^{Module data bus}
8TCNT0 8TCNT1
Figure 10.2 8TCNT Access Operation (CPU Writes to 8TCNT, Word)
Internal data bus
H
C
PL
U
Bus
interface
H
L ^{Module data bus}
8TCNT0 8TCNT1
Figure 10.3 8TCNT Access Operation (CPU Reads 8TCNT, Word)
Internal data bus
H
C
PL
U
Bus
interface
H
L ^{Module data bus}
8TCNT0 8TCNT1
Figure 10.4 8TCNTH Access Operation (CPU Writes to 8TCNTH, Upper Byte)
Rev.5.00 Sep. 12, 2007 Page 366 of 764
REJ09B0396-0500