M38B53M4-059FP datasheet(271/355 Pages) MITSUBISHI

271 / 355 page

38B5 Group User’s Manual

3-23

APPENDIX

3.3 Notes on use

(2)

Decimal calculations

Execution of decimal calculations

The ADC and SBC are the only instructions which will yield proper decimal notation, set the

decimal mode flag (D) to “1” with the SED instruction. After executing the ADC or SBC instruction,

execute another instruction before executing the SEC, CLC, or CLD instruction.

Notes on status flag in decimal mode

When decimal mode is selected, the values of three of the flags in the status register (the N, V,

and Z flags) 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.

(3)

JMP instruction

When using the JMP instruction in indirect addressing mode, do not specify the last address on a

page as an indirect address.

3.3.11 Programming and test of built-in PROM version

As for in the One Time PROM version (shipped in blank) and the built-in EPROM version, their built-in

PROM can be read or programmed with a general-purpose PROM programmer using a special programming

adapter.

The built-in EPROM version is available only for program development and on-chip program evaluation.

The programming test and screening for PROM of the One Time PROM version (shipped in blank) are not

performed in the assembly process and the following processes. To ensure reliability after programming,

performing programming and test according to the Figure 3.3.10 before actual use are recommended.

Set D flag to “1”

↓

ADC or SBC instruction

↓

NOP instruction

↓

SEC, CLC, or CLD instruction

Fig. 3.3.9 Status flag at decimal calculations

Fig. 3.3.10 Programming and testing of One Time PROM version

Programming with PROM programmer

Screening (Caution)

(Leave at 150 °C for 40 hours)

Verification with PROM programmer

Functional check in target device

Caution: The screening temperature is far higher than the

storage temperature. Never expose to 150 °C

exceeding 100 hours.

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