Renesas RL78 Series User Manual page 294

RL78/G1D
Table 8-2 shows the relationship between the setting value of the AMPM bit, the hour count register (HOUR) value, and
time.
The HOUR register value is set to 12-hour display when the AMPM bit is "0" and to 24-hour display when the AMPM bit
is "1".
In 12-hour display, the fifth bit of the HOUR register displays 0 for AM and 1 for PM.
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
Table 8-2. Displayed Time Digits
24-Hour Display (AMPM = 1)
Time HOUR Register
0 00H
1 01H
2 02H
3 03H
4 04H
5 05H
6 06H
7 07H
8 08H
9 09H
10 10H
11 11H
12 12H
13 13H
14 14H
15 15H
16 16H
17 17H
18 18H
19 19H
20 20H
21 21H
22 22H
23 23H
CHAPTER 8 REAL-TIME CLOCK
12-Hour Display (AMPM = 0)
Time HOUR Register
12 a.m. 12H
1 a.m. 01H
2 a.m. 02H
3 a.m. 03H
4 a.m. 04H
5 a.m. 05H
6 a.m. 06H
7 a.m. 07H
8 a.m. 08H
9 a.m. 09H
10 a.m. 10H
11 a.m. 11H
12 p.m. 32H
1 p.m. 21H
2 p.m. 22H
3 p.m. 23H
4 p.m. 24H
5 p.m. 25H
6 p.m. 26H
7 p.m. 27H
8 p.m. 28H
9 p.m. 29H
10 p.m. 30H
11 p.m. 31H
273