Instruction manual

Page
49
PC215E
5.3.19 Group Z Clock Connection Register
This is the register that can be used to select the counter/timer clock sources for the six
counter/timers on the PC215E board.
Register
Offset
Write and/or
Read
Register
Width
Register
Title
Mnemonic
1A
16
Write 8 bits
Group Z Counter/timer Clock
Selection Register
ZCLK_SCE
FUNCTION
Individually selects one of the eight possible Counter/Timer clock sources for each of the six
counter/timers on the PC215E board. The selected source will then appear on the clock input of
the specified counter/timer.
The Eight Clock Sources
The eight possible clock sources are as follows:
1. The counter/timer's CLK input from the SK1 connector
2. The internal 10 MHz clock
3. The internal 1 MHz clock
4. The internal 100 kHz clock
5. The internal 10 kHz clock
6. The internal 1 kHz clock
7. The output of the preceding counter/timer
8. The dedicated external clock input for Z1/Z2
BIT ASSIGNMENTS
01234567
Clock Source
CLK n
10 MHz
1 MHz
100 kHz
10 kHz
1 kHz
OUT n-1
Ext Clock
bit 0
0
1
0
1
0
1
0
1
bit 1
0
0
1
1
0
0
1
1
bit 2
0
0
0
0
1
1
1
1
Counter/Timer
Counter 0
Counter 1
Counter 2
Reserved
bit 3
0
1
0
1
bit 4
0
0
1
1
Reserved
bit 6
X
bit 7
X
bit 5
0
1
Counter/Timer Device
Z1
Z2