80 PPC11A 6U VME Single Board Computer
Publication No. PPC11A-HRM/1
5.15.4 Timer Data Byte Registers
The read value depends on bit 3 of the corresponding Timer Control and Status
Register 1 (TC&S1[3]).
Register
Offset Read Value
Write
Default
TC&S1[3] = 0
TC&S1[3] = 1
Timer 0 Data Byte 0 (LS Byte)
0x654 Bits [7:0] of the
Timer current
counter value
Bits [7:0] of the
Timer load value
Updates the Timer
load value
0x00
Timer 1 Data Byte 0 (LS Byte)
0x65C
0x00
Timer 2 Data Byte 0 (LS Byte)
0x664
0x00
Timer 3 Data Byte 0 (LS Byte)
0x66C
0x00
Timer 0 Data Byte 1
0x655 Bits [15:8] of the
Timer current
counter value
Bits [15:8] of the
Timer load value
Updates the Timer
load value
0x00
Timer 0 Data Byte 1
0x65D
0x00
Timer 2 Data Byte 1
0x665
0x00
Timer 3 Data Byte 1
0x66D
0x00
Timer 0 Data Byte 2
0x656 Bits [23:16] of the
Timer current
counter value
Bits [23:16] of the
Timer load value
Updates the Timer
load value
0x00
Timer 1 Data Byte 2
0x65E
0x00
Timer 2 Data Byte 2
0x666
0x00
Timer 3 Data Byte 2
0x66E
0x00
Timer 0 Data Byte 3 (MS Byte)
0x657 Bits [31:24] of the
Timer current
counter value
Bits [31:24] of the
Timer load value
Causes the Timer
to reload the
complete 32-bit
load value
immediately
0x00
Timer 1 Data Byte 3 (MS Byte)
0x65F
0x00
Timer 2 Data Byte 3 (MS Byte)
0x667
0x00
Timer 3 Data Byte 3 (MS Byte)
0x66F
0x00
Reading a Timer Data Byte 0 register latches the upper bits of the Timer current
counter value to prevent rollover (this may be the corresponding timer or all timers,
depending on bit 4 of the Timer Control/Status Register 2).
Содержание PPC11A
Страница 1: ...Hardware Reference Manual PPC11A 6U VME Single Board Computer Edition 1 Publication No PPC11A HRM 1 ...
Страница 27: ...Publication No PPC11A HRM 1 Functional Description 27 Figure 4 2 Block Diagram T2081 ...
Страница 113: ...Publication No PPC11A HRM 1 Connectors 113 Figure 6 2 Rear Connector Position ...