SN32F100 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 88
Version 1.9
7.7.5 CT32Bn Count Control register (CT32Bn_CNTCTRL) (n=0,1)
Address Offset: 0x10
This register is used to select between Timer and Counter mode, and in Counter mode to select the pin and edges for
counting.
When Counter Mode is chosen as a mode of operation, the CAP input (selected by CIS bits) is sampled on every rising
edge of the PCLK clock. After comparing two consecutive samples of this CAP input, one of the following four events is
recognized: rising edge, falling edge, either of edges or no changes in the level of the selected CAP input. Only if the
identified event occurs, and the event corresponds to the one selected by CTM bits in this register, will the Timer
Counter register be incremented.
Effective processing of the externally supplied clock to the counter has some limitations. Since two successive rising
edges of the PCLK clock are used to identify only one edge on the CAP selected input, the frequency of the CAP input
cannot exceed one half of the PCLK clock. Consequently, the duration of the HIGH/LOW levels on the same CAP input
in this case cannot be shorter than 1/ (2 x PCLK).
Note: If Counter mode is selected in the CNTCTRL register, Capture Control (CAPCTRL) register must be
programmed as 0x0.
Bit
Name
Description
Attribute
Reset
31:4
Reserved
R
0
3:2
CIS[1:0]
Count Input Select.
In counter mode (when CTM[1:0] are not 00), these bits select which CAP
pin is sampled for clocking.
00: CT32Bn_CAP0
Other: Reserved.
R/W
0
1:0
CTM[1:0]
Counter/Timer Mode.
This field selects which rising PCLK edges can
increment Timer’s
Prescale Counter (PC), or
clear PC and increment Timer Counter (TC).
00: Timer Mode: every rising PCLK edge
01: Counter Mode: TC is incremented on rising edges on the CAP input
selected by CIS bits.
10: Counter Mode: TC is incremented on falling edges on the CAP input
selected by CIS bits.
11: Counter Mode: TC is incremented on both edges on the CAP input
selected by CIS bits.
R/W
0
7.7.6 CT32Bn Match Control register (CT32Bn_MCTRL) (n=0,1)
Address Offset: 0x14
Bit
Name
Description
Attribute
Reset
31:12
Reserved
R
0
11
MR3STOP
Stop MR3: TC and PC will stop and CEN bit will be cleared if MR3
matches TC.
0: Disable
1: Enable
R/W
0
10
MR3RST
Enable reset TC when MR3 matches TC.
0: Disable
1: Enable
R/W
0
9
MR3IE
Enable generating an interrupt when MR3 matches the value in the TC.
0: Disable
1: Enable
R/W
0
8
MR2STOP
Stop MR2: TC and PC will stop and CEN bit will be cleared if MR2
matches TC.
0: Disable
1: Enable
R/W
0
7
MR2RST
Enable reset TC when MR2 matches TC.
0: Disable
1: Enable
R/W
0
