NEC 78K0 User Manual page 419

Multiplication/division data register B0 Remainder data register 0
(MDB0 (MDB0H+MDB0L) (SDR0 (SDR0H+SDR0L)
Controller
17-bit
adder
Figure 18-1. Block Diagram of Multiplier/Divider
Internal bus
Multiplication/division data register A0
(MDA0H (MDA0HH + MDA0HL) + MDA0L (MDA0LH + MDA0LL))
Controller
*
Controller
Multiplier/divider control
register 0 (DMUC0)
DMUSEL0 DMUE
Start
MDA000
6-bit
counter
INTDMU
Clear
CPU clock