U4223B ATMEL Corporation, U4223B Datasheet - Page 14

• Manufacturer Part Number: U4223B
• Description: Time-code Receiver With A/d Converter
• Manufacturer: ATMEL Corporation

Information on the British Transmitter
Station: MSF
Frequency 60 kHz
Transmitting power 50 kW
Location: Teddington, Middlesex
Modulation
The carrier amplitude is switched off at the beginning of
each second for a period of 100 ms (binary zero) or
200 ms (binary one).
U4223B
14 (18)
0
Example:
March 1993
seconds
5
500 ms
Switch over to
the next time frame
0
10
17
500 ms
80
15
18
1
40
20
19
year
20
Time frame 1 minute
20
25
( index count 1 second)
month
10
21
year
30
day of
month
8
Figure 25.
22
35
day
of
week
4
Geographical coordinates: 52_ 22’N, 01_ 11’W
Time of transmission: permanent, except the first
Tuesday of each month from 10.00 h to 14.00 h.
Time-Code Format
The time-code format consists of 1-minute time frames.
A time frame contains BCD–coded information of year,
month, calendar day, day of the week, hours and minutes.
At the switch-over to the next time frame, the carrier
amplitude is switched off for a period of 500 ms.
The prescence of the fast code during the first 500 ms at
the beginning of the minute in not guaranteed. The trans-
mission rate is 100 bits/s and the code contains
information of hour, minute, day and month.
23
40
hour
2
24
45
1
minute
25
Parity
check
bits
50
10
26
55
8
27
month
0
minute
identifier
4
BST
hour + minute
day of week
day + month
year
BST 7 GMT change
impending
28
Rev. A7, 06-Mar-01
Time frame
5
2
29
10
1
30