UPD78F0411GA-GAM-AX Datasheet, PDF (270/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 9 REAL-TIME COUNTER
(4) Real-time counter control register 2 (RTCC2)
The RTCC2 register is an 8-bit register that is used to control the interval interrupt function and the RTCDIV
pin.
RTCC2 can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 9-5. Format of Real-Time Counter Control Register 2 (RTCC2)
Address: FF8BH After reset: 00H R/W
Symbol
<7>
<6>
<5>
4
RTCC2
RINTE
RCLOE2
RCKDIV
0
3
2
1
0
0
ICT2
ICT1
ICT0
RINTE
ICT2
ICT1
ICT0
0
×
×
×
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
×
Change ICT2, ICT1, and ICT0 when RINTE = 0.
Interval interrupt (INTRTCI) selection
Interval interrupt is not generated.
2⁶/fRTC (1.953125 ms)
2⁷/fRTC (3.90625 ms)
2⁸/fRTC (7.8125 ms)
2⁹/fRTC (15.625 ms)
2¹⁰/fRTC (31.25 ms)
2¹¹/fRTC (62.5 ms)
2¹²/fRTC (125 ms)
RCLOE2^Note
0
Output of RTCDIV pin is disabled.
1
Output of RTCDIV pin is enabled.
RTCDIV pin output control
RCKDIV
0
1
Selection of RTCDIV pin output frequency
RTCDIV pin outputs 512 Hz.
RTCDIV pin outputs 16.384 kHz.
Note RCLOE0 and RCLOE2 must not be enabled at the same time.
Caution When the output from RTCDIV pin is stopped, the output continues after a maximum of two
clocks of fRTC and enters the low level. While 512 Hz is output, and when the output is
stopped immediately after entering the high level, a pulse of at least one clock width of fXT
may be generated.
268
User’s Manual U18698EJ1V0UD