r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 444

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
21.2
Figure 21.1
In real-time clock mode, a 1-second signal is generated from fC4 using a divide-by-2 frequency divider, 4-bit
counter, and 8-bit counter and used to count seconds, minutes, hours, and days of the week. Figure 21.1 shows a
Block Diagram of Real-Time Clock Mode and Table 21.2 lists the Real-Time Clock Mode Specifications. Table
21.3 lists the Interrupt Sources, Figure 21.2 shows the Definition of Time Representation and Figure 21.3 shows
the Operating Example in Real-Time Clock Mode.
(8.192kHz)
Real-Time Clock Mode
fC4
TOENA, H12_H24, PM, INT: Bits in TRECR1 register
SEIE, MNIE, HRIE, DYIE, WKIE: Bits in TRECR2 register
BSY: Bit in TRESEC, TREMIN, TREHR, TREWK register
RCS4 to RCS6: Bits in TRECSR register
Note
BSY
bit
1: The TREOSEL0 bit in the TIMSR register is used to select which pin is assigned.
TRESEC
register
Block Diagram of Real-Time Clock Mode
1/2
MNIE
SEIE
Overflow
TREMIN
4-bit counter
register
(1/16)
HRIE
Overflow
H12_H24
bit
Data bus
TREHR
register
8-bit counter
(1/256)
PM
bit
DYIE
Overflow
WKIE
TREWK
register
(1s) Overflow
000
fC
f2
f4
f8
= 010b
RCS6 to RCS4
= 001b
= 100b
Timing
control
= 000b
= 011b
INT
bit
Timer RE
interrupt
TOENA
Page 412 of 740
TREO pin
21. Timer RE
(1)