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RL78 Family

Chapter 4

Using EEPROM Emulation

EEPROM Emulation Library Pack02

R01US0068EJ0100

Rev.1.00

Page 29 of 53

Mar. 28, 2014

(1) Operation frequency

This sets an operation frequency which is used in RL78 microcontrollers.

Note1

The setting value is set to the FDL_Init frequency parameter by the following expressions (The frequency is

calculated by raising its decimals. The result calculated omits its decimals.).

Setting value of FDL_Init operation frequency = ((FDL_SYSTEM_FREQUENCY + 999999)/1000000)

Ex.1: When FDL_SYSTEM_FREQUENCY is 20000000 (20 MHz),

((20000000 + 999999)/10000000) = 20.999999 = 20

Ex.2: When FDL_SYSTEM_FREQUENCY is 4500000 (4.5 MHz),

((4500000 + 999999)/10000000) = 5.499999 = 5

Ex.3: When FDL_SYSTEM_FREQUENCY is 5000001 (5.000001 MHz),

((5000001 + 999999)/10000000) = 6.000000 = 6

Note1:

This setting is a value required to control data flash memory. This setting does not change the

operation frequency of RL78 microcontrollers. In addition, this operation frequency is not the

frequency of the high-speed on-chip oscillator.

(2) Voltage mode

Note 2

This sets the voltage mode of data flash memory.

Note 3

When FDL_WIDE_VOLTAGE_MODE is not defined: Full-speed mode

When FDL_WIDE_VOLTAGE_MODE is defined: Wide voltage mode

Note 2: The FDL_WIDE_VOLTAGE_MODE is commented out and not defined in the initial setting. To use

RL78 microcontrollers in the wide voltage mode, cancel the comment-out to define the mode.

Note 3: For details of the voltage mode, see the corresponding RL78 microcontrollers user’s manual.

(3) FDL pool size

Specify 0.

(4) EEL pool size

Note 4

The number of blocks in the data flash memory of the target device must be specified as the number of

blocks in the EEL pool.

Note 4: Specify 3 (3 blocks) or a greater value (recommended).

(5) Number of stored data items

Specify the number of data items to be used in the EEPROM emulation. A value of 1 to 64 can be set.

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