HD64336011G datasheet(65/384 Pages) RENESAS

부품명	HD64336011G

상세설명	Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

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Section 2 CPU

Rev. 4.00 Sep. 23, 2005 Page 39 of 354

REJ09B0025-0400

(1)

Bit manipulation for two registers assigned to the same address

Example: Bit manipulation for the timer load register and timer counter

(Applicable for timer B and timer C, not for the group of this LSI.)

Figure 2.13 shows an example of a timer in which two timer registers are assigned to the same

address. When a bit manipulation instruction accesses the timer load register and timer counter of

a reloadable timer, since these two registers share the same address, the following operations takes

place.

1. Data is read in byte units.

2. The CPU sets or resets the bit to be manipulated with the bit manipulation instruction.

3. The written data is written again in byte units to the timer load register.

The timer is counting, so the value read is not necessarily the same as the value in the timer load

register. As a result, bits other than the intended bit in the timer counter may be modified and the

modified value may be written to the timer load register.

Read

Write

Count clock

Timer counter

Timer load register

Reload

Internal bus

Figure 2.13 Example of Timer Configuration with Two Registers Allocated to

Same Address

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