HCS08 datasheet(193/316 Pages) NXP

193 / 316 page

Real-Time Counter (S08RTCV1)

MC9S08SG8 MCU Series Data Sheet, Rev. 8

Freescale Semiconductor

193

13.3.1

RTC Status and Control Register (RTCSC)

RTCSC contains the real-time interrupt status flag (RTIF), the clock select bits (RTCLKS), the real-time

interrupt enable bit (RTIE), and the prescaler select bits (RTCPS).

432

RTIF

RTCLKS

RTIE

RTCPS

Reset:

Figure 13-3. RTC Status and Control Register (RTCSC)

Table 13-2. RTCSC Field Descriptions

Field

Description

RTIF

Real-Time Interrupt Flag This status bit indicates the RTC counter register reached the value in the RTC modulo

clears RTIF.

0 RTC counter has not reached the value in the RTC modulo register.

1 RTC counter has reached the value in the RTC modulo register.

6–5

RTCLKS

Real-Time Clock Source Select. These two read/write bits select the clock source input to the RTC prescaler.

Changing the clock source clears the prescaler and RTCCNT counters. When selecting a clock source, ensure

that the clock source is properly enabled (if applicable) to ensure correct operation of the RTC. Reset clears

RTCLKS.

00 Real-time clock source is the 1-kHz low power oscillator (LPO)

01 Real-time clock source is the external clock (ERCLK)

1x Real-time clock source is the internal clock (IRCLK)

RTIE

Real-Time Interrupt Enable. This read/write bit enables real-time interrupts. If RTIE is set, then an interrupt is

generated when RTIF is set. Reset clears RTIE.

0 Real-time interrupt requests are disabled. Use software polling.

1 Real-time interrupt requests are enabled.

3–0

RTCPS

Real-Time Clock Prescaler Select. These four read/write bits select binary-based or decimal-based divide-by

values for the clock source. See Table 13-3. Changing the prescaler value clears the prescaler and RTCCNT

counters. Reset clears RTCPS.

Table 13-3. RTC Prescaler Divide-by values

RTCLKS[0]

RTCPS

101112

Off

210

102

5x102

103

Off

210

211

212

213

214

215

216

103

2x103 5x103

104

2x104 5x104

105

2x105

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