SAM4L Datasheet, PDF (719/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
27.9.2 Clock Waveform Generator Register
Name:
CWGR
Access Type:
Read/Write
Offset:
0x04
Reset Value:
0x00000000
31
30
29
28
27
26
25
24
-
EXP
DATA
23
22
21
20
19
18
17
16
STASTO
15
14
13
12
11
10
9
8
HIGH
7
6
5
4
3
2
1
0
LOW
• EXP: Clock Prescaler
Used to specify how to prescale the TWCK clock. Counters are prescaled according to the following formula
f_PRESCALER
=
f_{--C----L--K---_---T---W----I--M--}
2^{(EXP + 1)}
• DATA: Data Setup and Hold Cycles
Clock cycles for data setup and hold count. Prescaled by CWGR.EXP. Used to time T_{HD_DAT}, T_{SU_DAT}.
• STASTO: START and STOP Cycles
Clock cycles in clock high count. Prescaled by CWGR.EXP. Used to time T_{HD_STA}, T_{SU_STA}, T_{SU_STO}
• HIGH: Clock High Cycles
Clock cycles in clock high count. Prescaled by CWGR.EXP. Used to time T_HIGH.
• LOW: Clock Low Cycles
Clock cycles in clock low count. Prescaled by CWGR.EXP. Used to time T_LOW, T_BUF.
42023C–SAM–02/2013
719