DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 353

• Manufacturer Part Number: DF2211NP24V
• Description: H8S/2200 Series, 2212 Group, USB, RTC, HSS TNP-64B; Vcc= 2.7 to 3.6 volts, Temp= -20 to 75 C; Package: PVQN0064LB-A
• Manufacturer: Renesas Technology / Hitachi Semiconductor

9.4
9.4.1
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 from 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.
9.4.2
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 to 9.5.
Bus
master
Figure 9.2 16-Bit Register Access Operation [Bus Master ↔ TCNT (16 Bits)]
16-Bit Registers
Interface to Bus Master
8-Bit Registers
Internal data bus
H
L
Bus interface
TCNTH
Rev.7.00 Dec. 24, 2008 Page 299 of 698
TCNTL
REJ09B0074-0700
Module
data bus