RL78/G15 CHAPTER 19 FLASH MEMORY
R01UH0959EJ0110 Rev.1.10 Page 675 of 765
Mar 7, 2023
19.6.1.5 Flash memory sequencer initial setting register (FSSET)
The FSSET register sets the operating frequency of the flash memory sequencer.
The FSSET register can be set by an 8-bit memory manipulation instruction.
This register is set to 00H following a reset.
Figure 19-12. Format of Flash Memory Sequencer Initial Setting Register (FSSET)
Address: F00BEH After reset: 00H R/W
Symbol 7 6 5 4 3 2 1 0
FSSET 0 0 0 FSET4 FSET3 FSET2 FSET1 FSET0
FSET4-0 Setting of the operating frequency of the flash memory sequencer
— Set the operating frequency of the flash memory sequencer.
For the correspondence between the operating frequency of the flash memory sequencer and the setting
of the FSET4-0 bits, see Table 19-10.
Caution Set the value corresponding to that obtained by rounding the CPU operating frequency up to the
nearest whole number in the FSET4-0 bits. For example, when the CPU operating frequency is 4.5
MHz, set the bits for 5 MHz.
Note that frequencies that are not whole numbers, such as 1.5 MHz, are not available as CPU
operating frequencies below 4 MHz.
Table 19-10. Correspondence between the Operating Frequency of the Flash Memory Sequencer and the Setting of
the FSET4-0 Bits
Operating
frequency
[MHz]
Setting of the
FSET4-0 bits
Operating
frequency
[MHz]
Setting of the
FSET4-0 bits
Operating
frequency
[MHz]
Setting of the
FSET4-0 bits
16 01111B 10 01001B 4 00011B
15 01110B 9 01000B 3 00010B
14 01101B 8 00111B 2 00001B
13 01100B 7 00110B 1 00000B
12 01011B 6 00101B — —
11 01010B 5 00100B — —
To Next Page
Loading...
Need help?
General
