h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 79
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h8s-2172
Manufacturer Part Number
h8s-2172
Description
Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2172.pdf
(570 pages)
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2.9
2.9.1
Bit manipulation instructions such as BSET, BCLR, BNOT, BST, and BIST read data in byte
units, perform bit manipulation, and write data in byte units. Thus, care must be taken when these
bit manipulation instructions are executed for a register or port including write-only bits.
In addition, the BCLR instruction can be used to clear the flag of an internal I/O register. In this
case, if the flag to be cleared has been set by an interrupt processing routine, the flag need not be
read before executing the BCLR instruction.
Notes: 1. From any state except hardware standby mode, a transition to the reset state occurs whenever
2. In every state, when the STBY pin becomes low, the hardware standby mode is entered.
3. For details, refer to section 16, Power-Down Modes.
A transition can also be made to the reset state when the watchdog timer overflows.
Usage Note
Note on Bit Manipulation Instructions
handling state
Reset state
Exception
Reset state
*1
= High
Figure 2.13 State Transitions
External interrupt request
Program execution state
= Low
= High,
Rev. 2.00, 03/04, page 47 of 534
Hardware standby
Software standby
Power-down state
Sleep mode
mode
mode
*2
*3
goes low.
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