UPD75518 NEC, UPD75518 Datasheet - Page 145

• Manufacturer Part Number: UPD75518
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC

(2) Bit manipulation instructions
• When the group of the string effect instruction before the GETI instruction is the same as that of the
• When the group of the instruction after the GETI instruction is the same as that of the instruction
Since PC does not increment the counter during execution of a GETI instruction, control returns to the
address next to the GETI instruction after the execution of the GETI instruction.
When the instruction before a GETI instruction has the skip function, the GETI instruction is skipped in
the same way as for other 1-byte instructions. When the instruction referenced by a GETI instruction has
the skip function, the instructions after the GETI instruction are skipped.
When a string effect instruction is referenced by a GETI instruction, the following results are obtained.
The PD75518(A) is provided with bit test instructions, bit transfer instructions, and bit Boolean instruc-
tions (AND, OR, and XOR) in addition to normal bit manipulation instructions (set instruction and clear
instruction). Manipulation bits are specified by bit manipulation addressing.
There are three types of bit manipulation addressing. The table below lists the bits manipulated by each
addressing.
fmem.bit
pmem.@L
@H+mem.bit
MB = MBE•MBS
instruction referenced by the GETI instruction, the effect of the string effect instruction is canceled and
the referenced instruction is not skipped.
referenced by the GETI instruction, the effect of the string effect instruction caused by the referenced
instruction is valid and the instructions after the referenced instruction are skipped.
Addressing
: 0, 1, 2, 4, BT, T0, W, CSI0, TPG
RBE/MBE/IST1, IST0/EOT
IE
Port 0 to Port 15
BSB0
Ports 0, 4, 8, and 12
All
manipulatable)
/IRQ
Specifiable peripheral hardware
the
peripheral
hardware
(bit-
FB0H to FBFH
FF0H to FFFH
FC0H to FFFH
All the bits of the memory bank specified by
MB (bit-manipulatable)
Specifiable bit address range
PD75518(A)
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