DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 118
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DF2211NP24V
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
Datasheet
1.DF2211NP24V.pdf
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2.8
The H8S/2000 CPU has five main processing states: the reset state, exception handling state,
program execution state, bus-released state, and power-down state. Figure 2.13 indicates the state
transitions.
• Reset State
• Exception-Handling State
• Program Execution State
• Bus-Released State
• Power-Down State
Rev.7.00 Dec. 24, 2008 Page 64 of 698
REJ09B0074-0700
In this state the CPU and internal peripheral modules are all initialized and stop. When the RES
input goes low all current processing stops and the CPU enters the reset state. All interrupts are
masked in the reset state. Reset exception handling starts when the RES signal changes from
low to high. For details, refer to section 4, Exception Handling.
The reset state can also be entered by a watchdog timer overflow.
The exception-handling state is a transient state that occurs when the CPU alters the normal
processing flow due to an exception source, such as, a reset, trace, interrupt, or trap instruction.
The CPU fetches a start address (vector) from the exception vector table and branches to that
address. For further details, refer to section 4, Exception Handling.
In this state the CPU executes program instructions in sequence.
In a product which has a bus master other than the CPU, such as a direct memory access
controller (DMAC) and a data transfer controller (DTC), the bus-released state occurs when the
bus has been released in response to a bus request from a bus master other than the CPU. While
the bus is released, the CPU halts operations.
This is a power-down state in which the CPU stops operating. The program stop state occurs
when a SLEEP instruction is executed or the CPU enters hardware standby mode. For details,
refer to section 20, Power-Down Modes.
Processing States
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