DS1207

021798 4/17

COMMAND WORDS Table 1

Summary of the command words in hexadecimal as they apply to all function codes for both program mode and nor-

mal mode for the DS1207-G01 only.(See Figure 12 and Figure 13 for detailed command words.)

MODE

FUNCTION

COMMAND WORDS

MSB

LSB

NORMAL

READ

B0

01

62

NORMAL

WRITE

B0

01

9D

PROGRAM

WRITE

B0

02

9D

PROGRAM

READ DAY CLOCK COUNTER

B0

02

F1

PROGRAM

READ DAYS REMAINING

B0

02

F3

PROGRAM

WRITE DAYS REMAINING

B0

02

F2

PROGRAM

ARM OSCILLATOR

B0

02

F5

PROGRAM

LOCK NUMBER OF DAYS COUNT

B0

02

F6

PROGRAM

STOP OSCILLATOR

B0

02

F4

BLOCK DIAGRAM: NORMAL MODE Figure 1

D/Q

CLK

Command Register

Compare Register

64-Bit

Security Match

64-Bit

Identification

384-Bit

Secure Memory

RST

Garbled Data

Control

Logic