HCS08 datasheet(192/316 Pages) NXP

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Real-Time Counter (S08RTCV1)

MC9S08SG8 MCU Series Data Sheet, Rev. 8

192

Freescale Semiconductor

13.1.3

Block Diagram

The block diagram for the RTC module is shown in Figure 13-2.

Figure 13-2. Real-Time Counter (RTC) Block Diagram

13.2

External Signal Description

The RTC does not include any off-chip signals.

13.3

The RTC includes a status and control register, an 8-bit counter register, and an 8-bit modulo register.

Refer to the direct-page register summary in the memory section of this document for the absolute address

assignments for all RTC registers.This section refers to registers and control bits only by their names and

relative address offsets.

Table 13-1 is a summary of RTC registers.

Table 13-1. RTC Register Summary

Name

RTCSC

RTIF

RTCLKS

RTIE

RTCPS

RTCCNT

RTCMOD

Clock

Source

Select

Prescaler

Divide-By

8-Bit Counter

(RTCCNT)

8-Bit Modulo

(RTCMOD)

8-Bit Comparator

RTIF

RTIE

Background

VDD

RTC

Interrupt

Request

LPO

RTC

Clock

Mode

ERCLK

IRCLK

RTCLKS

Write 1 to

RTIF

RTCPS

RTCLKS[0]

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