RSK+RZA1H
6. Configuration
R20UT3007EG0200 Rev. 2.00
Page 41 of 53
May 17, 2015
6.5
MCU Boot and Oscillator Configuration
The six-way DIP switch, SW6 provides some configuration options for the RZ/A1H MCU. Switches 1, 2 and 3
are used to set the boot mode of the RZ/A1H. Table 6.20 provides details of the available modes and the
corresponding switch settings. Due to pull-up resistors in the circuit, a “1” is produced when the corresponding
switch position is OFF, and a “0” is produced when it is ON.
MD_BOOT0
SW6-1
MD_BOOT1
SW6-2
MD_BOOT2
SW6-3
JP18
Boot Mode
0
ON
0
ON
*
SHORT
Boot mode 0 (CS0-space 16-bit booting)
Boots the LSI from memory (bus width: 16 bits)
connected to the CS0 space.
Uses NOR flash (IC23).
0
ON
1
OFF
*
SHORT
Boot mode 1 (CS0-space 32-bit booting)
Boots the LSI from memory (bus width: 32 bits)
connected to the CS0 space.
Not supported on RSK+.
1
OFF
0
ON
1
OFF
*
Boot mode 3 (serial flash booting)
Boots the LSI from the serial flash memory connected to
the SPI multi I/O bus space. The only way of booting this
LSI chip is from channel 0 (P9_2 to P9_5) in this mode.
Uses QSPI flash (IC26 only).
1
OFF
1
OFF
0
ON
*
Boot mode 4 (eSD booting)
Boots the LSI from the NAND flash memory with the SD
controller. The only way of booting this LSI chip is from
channel 0 (P4_10 to P4_15) in this mode.
Not supported on RSK+.
1
OFF
1
OFF
1
OFF
*
Boot mode 5 (eMMC booting)
Boots the LSI from the NAND flash memory with the
MMC controller. The only way of booting this LSI chip is
from channel 0 (P3_10 to P3_15) in this mode.
Uses NAND flash (IC27).
Table 6.20: MCU Boot Modes
SW6-4
Clock Signal Source
ON
EXTAL (Uses OSC2, 13.33MHz.)
OFF
USB_X1 (Uses X4, 48MHz.)
Table 6.21: Clock Signal Source
SW6-5
Spread Spectrum Clock Generator (SSCG) Mode
ON
Enables the SSCG function of the MCU’s internal PLL circuit. This function attempts to
reduce EMI peak levels by slightly modulating the output frequency.
OFF
Disables the SSCG function.
Table 6.22: Spread Spectrum Clock Generator (SSCG) Mode
SW6-6 is for test purposes only (default is ON).
Note that it is not possible to boot from an SD card that is connected to the SD/MMC connector CN1. This is
because the connector utilises channel 1 of the SD controller, which can only boot from channel 0. For further
information, refer to the hardware manual, Table 3.1 (note column order is transposed
cf
. Table 6.20).
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from