MC68HC68 데이터 시트보기 (PDF) - Motorola => Freescale

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MC68HC68

Real-Time Clock plus RAM with Serial Interface

Motorola => Freescale 

Table 1. Clock/Calendar and Alarm Data Modes

Address Location

Read

Write

Function

Decimal Range

BCD Data Range BCD Date* Example

$20

$A0

Seconds

0 – 59

00 – 59

21

$21

$A1

Minutes

0 – 59

00 – 59

40

$22

$A2

Hours** (12 Hour Mode)

1 – 12

81 – 92 (AM)

90

A1 – B2 (PM)

Hours (24 Hour Mode)

0 – 23

00 – 23

10

$23

$A3

Day of Week (Sunday = 1)

1–7

01 – 07

03

$24

$A4

Date of Month

1 – 31

01 – 31

16

$25

$A5

Month (Jan = 1)

1 – 12

01 – 12

06

$26

$A6

Year

0 – 99

00 – 99

87

N/A

$A8

Seconds Alarm

0 – 59

00 – 59

21

N/A

$A9

Minutes Alarm

0 – 59

00 – 59

40

N/A

$AA

Hours Alarm*** (12 Hour Mode)

1 – 12

01 – 12 (AM)

10

21 – 32 (PM)

Hours Alarm (24 Hour Mode)

0 – 23

00 – 23

10

N/A = Not Applicable

* Example: 10:40:21 AM, Tuesday, June 16, 1987.

** Most significant data bit, D7, is “0” for 24–hour mode and “1” for 12–hour mode. Data bit D5 is “1” for PM and “0” for AM in 12–hour mode.

*** Data bit D5 is “1” for PM and “0” for AM in 12–hour mode. Data bits D7 and D6 are Don’t Cares.

Table 2. Watchdog Service and Reset Times

50 Hz

60 Hz

XTAL

Min

Max

Min

Max

Min

Max

Service Time

—

10 ms

—

8.3 ms

—

7.8 ms

Reset Time

20 ms

40 ms

16.7 ms 33.3 ms 15.6 ms 31.3 ms

NOTE: Reset does not occur immediately after slave select is toggled. Approximately two clock cycles later,

reset initiates.

SERVICE

TIME

SERVICE

TIME

SS

SCK

CPUR

MC68HC68T1

10

Figure 7. Watchdog Operation Waveforms

MOTOROLA

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