3069RF-ZTAT Datasheet, PDF (620/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

(a) Flash programming/erasing frequency parameter (FPEFEQ: general register ER0 of
CPU)
This parameter sets the operating frequency of the CPU.
For the range of the operating frequency of this LSI, see section 21.4.1, Clock Timing.
Bit :
31
30
29
28
27
26
25
24
0
0
0
0
0
0
0
0
Bit :
23
22
21
20
19
18
17
16
0
0
0
0
0
0
0
0
Bit :
15
14
13
12
11
10
9
8
F15
F14
F13
F12
F11
F10
F9
F8
Bit :
7
6
5
4
3
2
1
0
F7
F6
F5
F4
F3
F2
F1
F0
Bits 31 to 16—Unused: Only 0 may be written to these bits.
Bits 15 to 0—Frequency Set (F15 to F0): Set the operating frequency of the CPU. The setting
value must be calculated as the following methods.
1. The operating frequency which is shown in MHz units must be rounded in a number to three
decimal places and be shown in a number of two decimal places.
2. The centuplicated value is converted to the binary digit and is written to the FPEFEQ parameter
(general register R0). For example, when the operating frequency of the CPU is 25.000 MHz,
the value is as follows.
• The number to three decimal places of 25.000 is rounded and the value is thus 25.00.
• The formula that 25.00 × 100 = 2500 is converted to the binary digit and
b'0000,1001,1100,0100 (H'09C4) is set to R0.
Rev. 5.0, 09/04, page 598 of 978