HD6432646 Hitachi, HD6432646 Datasheet - Page 172

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HD6432646

Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet

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6.3.6
Caution is required in the following cases, as instruction execution is one state later than usual.
1. When the PBC is enabled (i.e. when the break interrupt enable bit is set to 1), execution of a
2. When break interruption by instruction fetch is set, the set address indicates on-chip ROM or
3. When break interruption by instruction fetch is set and a break interrupt is generated, if the
4. When break interruption by instruction fetch is set and a break interrupt is generated, if the
138
one-word branch instruction (Bcc d:8, BSR, JSR, JMP, TRAPA, RTE, or RTS) located in on-
chip ROM or RAM is always delayed by one state.
RAM space, and that address is used for data access, the instruction that executes the data
access is one state later than in normal operation.
executing instruction immediately preceding the set instruction has one of the addressing
modes shown below, and that address indicates on-chip ROM or RAM, and that address is
used for data access, the instruction will be one state later than in normal operation.
@ERn, @(d:16,ERn), @(d:32,ERn), @-ERn/ERn+, @aa:8, @aa:24, @aa:32, @(d:8,PC),
@(d:16,PC), @@aa:8
executing instruction immediately preceding the set instruction is NOP or SLEEP, or has
#xx,Rn as its addressing mode, and that instruction is located in on-chip ROM or RAM, the
instruction will be one state later than in normal operation.
When Instruction Execution is Delayed by One State

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