Internal Bus - Renesas M16C/64A Series User Manual

M16C/64A Group
11.3.2

Internal Bus

The internal bus is used to access the internal area in the MCU.
11.3.2.1 Software Wait States of the Internal Bus
The PM17 bit in the PM1 register, which is a software-wait-related bit, affects both the internal
memory and the external area. Table 11.3 lists Bits and Bus Cycles Related to Software Wait States
(SFR and Internal Memory).
The data flash of the internal ROM is affected by both the PM17 bit in the PM1 register and the
FMR17 bit in the FMR1 register.
Table 11.3 Bits and Bus Cycles Related to Software Wait States (SFR and Internal Memory)
Area
SFR
Internal RAM
Program ROM 1
Program ROM 2
Internal
ROM
Data flash
Note:
1. Status after reset.
R01UH0136EJ0210 Rev.2.10
Jul 31, 2012
Setting of Software-Wait-Related Bits
FMR1 register PM1 register
FMR17 bit
0 or 1
0 or 1
0 or 1
0
1
Software Wait
States
PM17 bit
0 or 1 1
0 None
1 1
0 None
1 1
0 or 1 1
0 None
1 1
11. Bus
Bus Cycle
(1)
2 BCLK cycles
(1)
1 BCLK cycle
2 BCLK cycles
(1)
1 BCLK cycle
2 BCLK cycles
(1)
2 BCLK cycles
1 BCLK cycle
2 BCLK cycle
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