M37632EFFP#U2 Renesas Electronics America, M37632EFFP#U2 Datasheet - Page 119

• Manufacturer Part Number: M37632EFFP#U2
• Description: IC 740 MCU 80QFP
• Manufacturer: Renesas Electronics America

Specifications of M37632EFFP#U2

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Fig. 4.4.5 Status flags in decimal mode
Rev.2.00 Nov 14, 2006
REJ09B0322-0200
(2) Status flags in decimal mode
4.4.4 JMP instruction
When using the JMP instruction in indirect addressing mode, do not specify the last address
on a page as an indirect address.
4.4.5 Multiplication and division instructions
The index mode (T) and the decimal mode (D) flags do not affect the MUL and DIV instruction.
The execution of these instructions does not change the contents of the processor status
register.
4.4.6 Ports
The contents of the port direction registers cannot be read.
The following cannot be used:
• The data transfer instruction (LDA, etc.)
• The operation instruction when the index X mode flag (T) is “1”
• The addressing mode which uses the value of a direction register as an index
• The bit-test instruction (BBC or BBS, etc.) to a direction register
• The read-modify-write instruction (ROR, CLB, or SEB, etc.) to a direction register
Use instructions such as LDM and STA, etc., to set the port direction registers.
4.4.7 Instruction execution time
The instruction execution time is obtained by multiplying the frequency of the internal clock
φ by the number of cycles needed to execute an instruction.
The number of cycles required to execute an instruction is shown in the list of machine
instructions.
When decimal mode is selected (D = 1), the values of three of the flags in the status
register (the flags N, V, and Z) are invalid after a ADC or SBC instruction is executed.
The carry flag (C) is set to “1” if a carry is generated as a result of the calculation, or
is cleared to “0” if a borrow is generated. To determine whether a calculation has
generated a carry, the C flag must be initialized to “0” before each calculation. To check
for a borrow, the C flag must be initialized to “1” before each calculation.
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SEC, CLC, or CLD instruction
ADC or SBC instruction
Set D flag to “1”
NOP instruction
NOTES ON USE