Renesas RL78 Series User Manual page 399

RL78/G1D
13.3.2 Serial clock select register m (SPSm)
The SPSm register is a 16-bit register that is used to select two types of operation clocks (CKm0, CKm1) that are
commonly supplied to each channel. CKm1 is selected by bits 7 to 4 of the SPSm register , and CKm0 is selected by bits
3 to 0.
Rewriting the SPSm register is prohibited when the register is in operation (when SEmn = 1).
The SPSm register can be set by a 16-bit memory manipulation instruction.
The lower 8 bits of the SPSm register can be set with an 8-bit memory manipulation instruction with SPSmL.
Reset signal generation clears the SPSm register to 0000H.
Address: F0126H, F0127H (SPS0), F0166H, F0167H (SPS1)
Symbol 15 14
SPSm 0 0
PRS PRS
mk3 mk2
0 0
0 0
0 0
0 0
0 1
0 1
0 1
0 1
1 0
1 0
1 0
1 0
1 1
1 1
1 1
1 1
Note When changing the clock selected for f
so after having stopped (serial channel stop register m (STm) = 000FH) the operation of the serial array
unit (SAU).
Caution Be sure to clear bits 15 to 8 to "0".
Remarks 1. f : CPU/peripheral hardware clock frequency
CLK
2. m: Unit number (m = 0, 1)
3. k = 0, 1
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
Figure 13-6. Format of Serial Clock Select Register m (SPSm)
13 12 11 10
0 0 0 0
PRS PRS
mk1 mk0
f
CLK
0 0 f 2 MHz
CLK
0 1 f /2 1 MHz
CLK
2
1 0 f /2 500 kHz
CLK
3
1 1 f /2 250 kHz
CLK
4
0 0 f /2 125 kHz
CLK
5
0 1 f /2 62.5 kHz
CLK
6
1 0 f /2 31.3 kHz
CLK
7
1 1 f /2 15.6 kHz
CLK
8
0 0 f /2 7.81 kHz
CLK
9
0 1 f /2 3.91 kHz
CLK
10
1 0 f /2 1.95 kHz
CLK
11
1 1 f /2 977 Hz
CLK
12
0 0 f /2 488 Hz
CLK
13
0 1 f /2 244 Hz
CLK
14
1 0 f /2 122 Hz
CLK
15
1 1 f /2 61 Hz
CLK
After reset: 0000H R/W
9 8 7 6
PRS PRS
0 0
m13 m12
Section of operation clock (CKmk)
= 2 MHz f = 5 MHz f
CLK CLK
5 MHz 10 MHz
2.5 MHz 5 MHz
1.25 MHz 2.5 MHz
625 kHz 1.25 MHz
313 kHz 625 kHz
156 kHz 313 kHz
78.1 kHz 156 kHz
39.1 kHz 78.1 kHz
19.5 kHz 39.1 kHz
9.77 kHz 19.5 kHz
4.88 kHz 9.77 kHz
2.44 kHz 4.88 kHz
1.22 kHz 2.44 kHz
610 kHz 1.22 kHz
305 Hz 610 Hz
153 kHz 305 Hz
(by changing the system clock control register (CKC) value), do
CLK
CHAPTER 13 SERIAL ARRAY UNIT
5 4 3 2
PRS PRS PRS PRS
m11 m10 m03 m02
Note 1
= 10 MHz f = 20 MHz f
CLK
20 MHz
10 MHz
5 MHz
2.5 MHz
1.25 MHz
625 kHz
313 kHz
156 kHz
78.1 kHz
39.1 kHz
19.5 kHz
9.77 kHz
4.88 kHz
2.44 kHz
1.22 kHz
610 Hz
1 0
PRS PRS
m01 m00
= 32 MHz
CLK
32 MHz
16 MHz
8 MHz
4 MHz
2 MHz
1 MHz
500 kHz
250 kHz
125 kHz
62.5 kHz
31.3 kHz
15.6 kHz
78.1 kHz
3.91 kHz
1.95 kHz
997 Hz
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