HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 148
HD6417615
Manufacturer Part Number
HD6417615
Description
Hardware Manual
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6417615.pdf
(873 pages)
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4.2.3
When the NMI pin is low and the RES pin is driven low, the device executes a manual reset. For a
reliable reset, the RES pin should be kept low for at least 20 clock cycles. During a manual reset,
the CPU’s internal state is initialized. All on-chip peripheral module registers are initialized,
except for the bus state controller (BSC), user break controller (UBC), and pin function controller
(PFC) registers, and the frequency modification register (FMR). When the chip enters the manual
reset state in the middle of a bus cycle, manual reset exception handling does not start until the bus
cycle has ended. Thus, manual resets do not abort bus cycles. See appendix B, Pin States, for the
state of individual pins in the manual reset state.
In a manual reset, manual reset exception handling starts when the NMI pin is kept low and the
RES pin is first kept low for a set period of time and then returned to high. The CPU will then
operate in the same way as for a power-on reset.
4.3
4.3.1
Address errors occur when instructions are fetched or data read or written, as shown in table 4.6.
130
Manual Reset
Address Errors
Sources of Address Errors
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