1.5. Dual-Port RAM Interface
Command 0x18: Request UTC Time Data (bc637 only)
This command queries current GPS and UTC time information derived from the GPS receiver. This
command must be used in conjunction with Command 0x19.
Byte
Type
Item
Value or Range
0
UINT8
ID
0x18
1
UINT8
GPS Time Format
See below
2
UINT8
Leap Second
0 to 0xff
3
INT8
Leap Second Flag
See below
4-7
UINT32
Leap Event UNIX Time
0 to 0xffffffff
GPS Time Format:
n
0x00 UTC Time (GPS time plus leap seconds)
n
0x01 GPS Time
Leap Second Flag:
n
0xff Deletion Event
n
0x00 No Event
n
0x01 Addition Event
Command 0x19: Request TFP Data
This command requests data from the TFP that is not available via the device registers. The TFP
transfers the requested data to the DPRAM Output Area. The data is available to the user as soon as
the TFP sets ACK bit 0.
Byte
Type
Item
Value or Range
0
UINT8
ID
0x19
1
UINT8
Req. data type
(See Below)
Requested Data Type Choices
0x10 Timing Mode
0x11 Timing Format
0x13 Current Year
0x14 Periodic Output (Sync Flag only)
0x15 Time Code Format
0x16 Time Code Modulation
0x17 Propagation Delay
0x18 UTC Time Data (bc637)
0x1B Time Code Output Format
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