UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 566

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

20.3 Register Controlling Multiplier/Divider
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Address: FF42H
The multiplier/divider is controlled by multiplier/divider control register 0 (DMUC0).
Note When DMUE is set to 1, the operation is started. DMUE is automatically cleared to 0 after the operation is
Cautions 1. If DMUE is cleared to 0 during operation processing (when DMUE is 1), the operation result
(1) Multiplier/divider control register 0 (DMUC0)
DMUC0
Symbol
DMUC0 is an 8-bit register that controls the operation of the multiplier/divider.
DMUC0 can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears DMUC0 to 00H.
complete.
2. Do not change the value of DMUSEL0 during operation processing (while DMUE is 1). If it is
3. If DMUE is cleared to 0 during operation processing (while DMUE is 1), the operation
DMUSEL0
DMUE
is not guaranteed. If the operation is completed while the clearing instruction is being
executed, the operation result is guaranteed, provided that the interrupt flag is set.
changed, undefined operation results are stored in multiplication/division data register A0
(MDA0) and remainder data register 0 (SDR0).
processing is stopped.
register A0 (MDA0), multiplication/division data register B0 (MDB0), and multiplier/divider
control register 0 (DMUC0), and start the operation (by setting DMUE to 1).
DMUE
After reset: 00H
<7>
0
1
0
1
Figure 20-5. Format of Multiplier/Divider Control Register 0 (DMUC0)
Note
Stops operation
Starts operation
Division mode
Multiplication mode
6
0
R/W
CHAPTER 20 MULTIPLIER/DIVIDER
User’s Manual U17554EJ4V0UD
5
0
To execute the operation again, set multiplication/division data
Operation mode (multiplication/division) selection
4
0
Operation start/stop
3
0
2
0
1
0
DMUSEL0
0