UPD78F0138 NEC, UPD78F0138 Datasheet - Page 356

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

16.4 Operations of Multiplier/Divider
16.4.1 Multiplication operation
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• Initial setting
• During operation
• End of operation
• Next operation
1. Set operation data to multiplication/division data register A0L (MDA0L) and multiplication/division data register
2. Set bits 0 (DMUSEL0) and 7 (DMUE) of multiplier/divider control register 0 (DMUC0) to 1. Operation will start.
3. The operation will be completed when 16 internal clocks have been issued after the start of the operation
4. The operation result data is stored in the MDA0L and MDA0H registers.
5. DMUE is cleared to 0 (end of operation).
6. After the operation, an interrupt request signal (INTDMU) is generated.
7. To execute multiplication next, start from the initial setting in 16.4.1 Multiplication operation.
8. To execute division next, start from the initial setting in 16.4.2 Division operation.
B0 (MDB0).
(intermediate data is stored in the MDA0L and MDA0H registers during operation, and therefore the read
values of these registers are not guaranteed).
CHAPTER 16 MULTIPLIER/DIVIDER
User’s Manual U16228EJ2V0UD