Renesas R-IN32M3 Series User Manual page 66

R-IN32M3-CL User's Manual
6.2 Cautionary Notes
The following cautionary notes apply when accessing the CC-Link IE Field (Intelligent device station).
(1) Accessing when the MEMIFSEL Pin being Low
The on-chip CPU (Cortex-M3) and DMA controller of the R-IN32M3-CL can access the CC-Link IE field.
(2) Accessing when the MEMIFSEL Pin being High
In the initial state, only the external MCU interface can access the CC-Link IE field and not the Cortex-M3 or DMA
controller. Access to the CC-Link IE field from the Cortex-M3 and DMA controller is enabled by switching the access
paths by using the SRAM bridge select register (SRAMBRSEL). For the detailed specification of the register, refer to the
R-IN32M3 Series User's Manual (Peripheral Modules).
Below is an example procedure for switching access paths.
Start
Unlock protects
Switch access paths
Set protects
Make access control settings
for the CC-Link IE field
End
Figure 6.2 Procedure for Switching Access Path to the CC-Link IE Field
Caution: When accessing the CC-Link IE field from an internal master of the R-IN32M3-CL
(Cortex-M3 or DMA controller), high level must be input to the P33 and P34 pins during a
reset. For details, see section 2.1.13, CC-Link IE Field Pins (Intelligent Device Station).
R18UZ0005EJ0400
Dec. 28, 2018
6. CC-Link IE Field (Intelligent Device Station) Function
System protect command register (SYSPCMD) = 0x0000 005A
System protect command register (SYSPCMD) = 0x0000 0001
System protect command register (SYSPCMD) = 0x0000 FFFE
System protect command register (SYSPCMD) = 0x0000 0001
(1) CC-Link IE field clock gate register (CIECLKGTD) = 0x0000 0001
0: Clock is operating / 1: Clock is stopped
(2) SRAM bridge select register (SRAMBRSEL) = 0ｘ0000 0001
0: Accessible from the external MCU interface
1: Accessible from the internal CPU (Cortex-M3) of R-IN32M3-CL
(3) CC-Link IE field clock gate register (CIECLKGTD) = 0x0000 0000
0: Clock is operating /1: Clock is stopped
System protect command register（SYSPCMD） = 0x0000 0000
CC-Link IE field wait delay register（CIEWAITDLY） = Initial value
(recommendation)
CC-Link IE field bus size control register (CIEBSC) = 0x0000 5555H
CC-Link IE field bus bridge control register (CIESMC) = 0x0000 1151H
Access from an internal CPU (Cortex-M3) of R-IN32M3-CL to the
CC-Link IE field is possible.
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