HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 73
HD6417034B
Manufacturer Part Number
HD6417034B
Description
32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417034B.pdf
(687 pages)
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Section 2 CPU
Reset State: In the reset state the CPU is reset. This occurs when the RES pin level goes low.
When the NMI pin is high, the result is a power-on reset; when it is low, a manual reset will occur.
When turning on the power, be sure to carry out a power-on reset.
In a power-on reset, all CPU internal states and on-chip supporting module registers are initialized.
In a manual reset, all CPU internal states and on-chip supporting module registers, with the
exception of the bus state controller (BSC) and pin function controller (PFC), are initialized. In a
manual reset, the BSC is not initialized, so refresh operations will continue.
Exception Handling State: Exception handling is a transient state that occurs when the CPU’s
processing state flow is altered by exception handling sources such as resets or interrupts.
In a reset, the initial values of the program counter PC (execution start address) and stack pointer
SP are fetched from the exception vector table and stored; the CPU then branches to the execution
start address and execution of the program begins.
For an interrupt, the stack pointer (SP) is accessed and the program counter (PC) and status
register (SR) are saved to the stack area. The exception handling routine start address is fetched
from the exception vector table; the CPU then branches to that address and the program starts
executing, thereby entering the program execution state.
Program Execution State: In the program execution state, the CPU sequentially executes the
program.
Power-Down State: In the power-down state, CPU operation halts and power consumption
decreases. The SLEEP instruction places the CPU in the power-down state. This state has two
modes: sleep mode and standby mode.
Bus-Released State: In the bus-released state, the CPU releases the bus to the device that has
requested it.
Rev. 7.00 Jan 31, 2006 page 47 of 658
REJ09B0272-0700
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