R8CSLASH29 datasheet(233/471 Pages) RENESAS

233 / 471 page

R8C/28 Group, R8C/29 Group

14. Timers

Rev.2.10

Sep 26, 2008

Page 216 of 441

REJ09B0279-0210

14.4.1

Real-Time Clock Mode (For N, D Version Only)

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 14.61 shows

a Block Diagram of Real-Time Clock Mode and Table 14.25 lists the Specifications of Real-Time Clock Mode.

Figures 14.62 to 14.66 and 14.68 and 14.69 show the registers associated with real-time clock mode. Table

14.26 lists the Interrupt Sources, Figure 14.67 shows the Definition of Time Representation and Figure 14.70

shows the Operating Example in Real-Time Clock Mode.

Figure 14.61

Block Diagram of Real-Time Clock Mode

TREWK

TREHR

TREMIN

TRESEC

H12_H24

bit

MNIE

HRIE

WKIE

000

DYIE

SEIE

Timer RE interrupt

INT

bit

BSY

bit

8-bit counter

4-bit counter

Overflow

(1s)

Overflow

1/2

(1/256)

(1/16)

fC4

H12_H24, PM, INT: Bits in TRECR1 register

BSY: Bit in registers TRESEC, TREMIN, TREHR, and TREWK

Timing

control

Data bus

Overflow

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