RX610 Group
26. ROM (Flash Memory for Code Storage)
R01UH0032EJ0120 Rev.1.20
Page 840 of 1006
Feb 20, 2013
26.2.14
Peripheral Clock Notification Register (PCKAR)
b7
b6
b5
b4
b3
b2
b1
b0
Value after reset:
0
0
0
0
0
0
0
0
Address: 007F FFE8h
Value after reset:
PCKA[7:0]
b15
b14
b13
b12
b11
b10
b9
b8
0
0
0
0
0
0
0
0
—
—
—
—
—
—
—
—
Bit
Symbol
Bit Name
Description
R/W
b7 to b0
PCKA[7:0]
Peripheral Clock Notification These bits are used to set the peripheral clock (PCLK) at the
programming/erasure for the ROM/data flash.
R/W
b15 to b8
Reserved
These bits are always read as 0. The write value should always be 0.
R/W
PCKAR is a register to notify the sequencer of the frequency setting data of the peripheral clock (PCLK) at the
programming/erasure for the ROM/data flash. This setting is used to control programming and erasure times.
When on-chip ROM is disabled, the data read from PCKAR is 0000h and writing is disabled.
PCKAR is initialized by a reset, or when the FRESET bit in FRESETR is set to 1.
PCKA[7:0] Bits (Peripheral Clock Notification)
These bits are used to set the peripheral clock (PCLK) at the programming/erasure for the ROM/data flash.
Set the PCKA[7:0] bits to the PCLK frequency and issue a peripheral clock notification command before
programming/erasure. Do not change the frequency during the programming/erasure processing for the ROM/data flash.
Calculate the setting value as follows:
•
Convert an operating frequency represented in MHz units to binary and write it to the PCKA[7:0] bits.
For example, when the operating frequency of the peripheral clock is 35.9 MHz, the setting value is calculated as
follows:
•
Round up 35.9
•
Convert 36 to binary and set the upper bits and lower bits of the PCKA[7:0] bits to 00h and 24h (0010 0100b).
Notes: 1. When the PCKA[7:0] bits are set to values outside the range from 8 to 50 MHz, do not issue a programming
command to the ROM/data flash.
2. When the PCKA[7:0] bits are set to a frequency that is different from the FCLK, the data of the ROM/E2
data flash may be damaged.
3. Please note that programming time depends on the frequency to some extent even if the PCKA[7:0] bits are
used.
Summary of Contents for RX600 Series
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