TMP86FS23UG datasheet(191/252 Pages) TOSHIBA

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Page 179

TMP86FS23UG

Note 1: The status register is initialized when the result register is cleared (RCLR = “1”).

Note 2: CARF, ZERF, SIGN, and OVRF are programmed at the end of calculation. They are not affected by a read from the status

Note 3: ZERF and SIGN are not affected by a write to the addend register.

Note 4: In multiply mode, OVRF and CARF are always read as “0”.

Note 5: Bit 7 to 5 are always read as “1”.

Note: In signed arithmetic mode, bit 15 is treated as the sign bit.

Note 1: In signed arithmetic mode, bit 15 is treated as the sign bit.

Note 2: Calculation can only be started by writing to both the lower byte (MPCDRL) and upper byte (MPCDRH) of the mul-

tiplicand register in this order.

Note 3: The multiplicand register can only be programmed when data is written in the order of lower byte and upper byte.

If data is only written to the upper byte, the written data cannot be read out. (If data is only written to the lower

byte, the written data can be read out.)

Note: In signed arithmetic mode, bit 31 contains the sign of the calculation result.

CARF

Carry flag

0: No carry occurred in multiply-accumulate operation.

1: Carry occurred in multiply-accumulate operation.

Read

only

ZERF

Zero flag

0: Calculation resulst is other than “00000000H”.

1: Calculation result is “00000000H”.

SIGN

Sign flag

0: Result register contents are positive or “00000000H”.

1: Result register contents are negative.

OVRF

Overflow flag

0: Overflow occurred.

1: No overflow occurred.

CALC

Operation status flag

0: Calculation not in progress

1: Calculation in progress

Multiplier data Register

MPLDRH, MPLDRL

(0FA7H, 0FA6H)

9876543210

MPLDRH (0FA7H)

MPLDRL (0FA6H)

(Initial value: 0000 0000 0000 0000)

R/W

Multiplicand data Register

MPCDRH, MPCDRL

(0FA9H, 0FA8H)

9876543210

MPCDRH (0FA9H)

MPCDRL (0FA8H)

(Initial value: 0000 0000 0000 0000)

R/W

Result Register

RCALDR4, RCALDR3

(0FADH, 0FACH)

RCALDR4 (0FADH)

RCALDR3 (0FACH)

(Initial value: 0000 0000 0000 0000)

Read only

RCALDR2, RCALDR1

(0FABH, 0FAAH)

9876543210

RCALDR2 (0FABH)

RCALDR1 (0FAAH)

(Initial value: 0000 0000 0000 0000)

Read only

Addend Register

MADDR4, MADDR3

(0FADH, 0FACH)

MADDR4 (0FADH)

MADDR3 (0FACH)

(Initial value: 0000 0000 0000 0000)

Write only

MADDR2, MADDR1

(0FABH, 0FAAH)

9876543210

MADDR2 (0FABH)

MADDR1 (0FAAH)

(Initial value: 0000 0000 0000 0000)

Write only

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