HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 279

• Manufacturer Part Number: HD6417034B
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

10.3
10.3.1
The timer counters (TCNT), general registers A and B (GRA, GRB), and buffer registers A and B
(BRA, BRB) are 16-bit registers. The SH CPU can access these registers a word at a time using a
16-bit data bus. Byte access is also possible. Read and write operations performed on TCNT in
word units are shown in figures 10.6 and 10.7. Byte-unit read and write operations on TCNTH and
TCNTL are shown in figures 10.8 to 10.11.
CPU
CPU
CPU
CPU Interface
16-Bit Accessible Registers
Internal data bus
Internal data bus
Internal data bus
H
H
H
L
L
L
Figure 10.8 TCNT Access (CPU to TCNT (Upper Byte))
Figure 10.6 TCNT Access (CPU to TCNT (Word))
Figure 10.7 TCNT Access (TCNT to CPU (Word))
interface
interface
interface
Bus
Bus
Bus
Section 10 16-Bit Integrated Timer Pulse Unit (ITU)
TCNTH
TCNTH
TCNTH
Rev. 7.00 Jan 31, 2006 page 253 of 658
TCNTL
TCNTL
TCNTL
H
H
H
L
L
L
REJ09B0272-0700
Module
data bus
Module
data bus
Module
data bus