MC9S08SH8CSC 데이터 시트보기 (PDF) - Freescale Semiconductor

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MC9S08SH8CSC

HCS08 Microcontrollers

Freescale Semiconductor 

Chapter 13 Real-Time Counter (S08RTCV1)

13.1.3 Block Diagram

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

LPO

ERCLK

IRCLK

Clock

Source

Select

Background

Mode

RTCLKS

RTCLKS[0]

RTCPS

Prescaler

Divide-By

RTC

Clock

8-Bit Modulo

VDD

(RTCMOD)

DQ

RTIF

8-Bit Comparator

8-Bit Counter

(RTCCNT)

E

R

Write 1 to

RTIF

RTIE

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

13.2 External Signal Description

The RTC does not include any off-chip signals.

RTC

Interrupt

Request

13.3 Register Definitio

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

RTCCNT

RTCMOD

7

6

5

4

3

2

1

0

R

RTIF

W

RTCLKS

RTIE

RTCPS

R

RTCCNT

W

R

RTCMOD

W

MC9S08SH8 MCU Series Data Sheet, Rev. 3

196

Freescale Semiconductor

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