C8051F040-TB Silicon Laboratories Inc, C8051F040-TB Datasheet - Page 290

• Manufacturer Part Number: C8051F040-TB
• Description: BOARD PROTOTYPING W/C8051F040
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F040-TB

• Contents: Board
• Processor To Be Evaluated: C8051F04x
• Interface Type: USB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: C8051F040
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

C8051F040/1/2/3/4/5/6/7
The C/T0 bit (TMOD.2) selects the counter/timer's clock source. When C/T0 is set to logic 1, high-to-low
transitions at the selected Timer 0 input pin (T0) increment the timer register (Refer to
“17.1. Ports 0 through 3 and the Priority Crossbar Decoder” on page 204
and configuring external I/O pins). Clearing C/T0 selects the clock defined by the T0M bit (CKCON.3).
When T0M is set, Timer 0 is clocked by the system clock. When T0M is cleared, Timer 0 is clocked by the
source selected by the Clock Scale bits in CKCON (see SFR Definition 23.3).
Setting the TR0 bit (TCON.4) enables the timer when either GATE0 (TMOD.3) is logic 0 or the input signal
/INT0 is logic-level 1. Setting GATE0 to ‘1’ allows the timer to be controlled by the external input signal /
INT0 (see
surements.
Setting TR0 does not force the timer to reset. The timer registers should be loaded with the desired initial
value before the timer is enabled.
TL1 and TH1 form the 13-bit register for Timer 1 in the same manner as described above for TL0 and TH0.
Timer 1 is configured and controlled using the relevant TCON and TMOD bits just as with Timer 0. The
input signal /INT1 is used with Timer 1.
23.1.2. Mode 1: 16-bit Counter/Timer
Mode 1 operation is the same as Mode 0, except that the counter/timer registers use all 16 bits. The coun-
ter/timers are enabled and configured in Mode 1 in the same manner as for Mode 0.
288
Note: X = Don't Care
TR0
0
1
1
1
/INT0
T0
Section “12.3.5. Interrupt Register Descriptions” on page
Crossbar
GATE0
X
0
1
1
Pre-scaled Clock
SYSCLK
GATE0
/INT0
Figure 23.1. T0 Mode 0 Block Diagram
X
X
0
1
TR0
0
1
Counter/Timer
Disabled
Disabled
Enabled
Enabled
CKCON
T
M
1
0
1
M
T
0
S
C
A
1
Rev. 1.5
S
C
A
0
G
A
T
E
1
C
T
1
/
M
T
1
1
TMOD
M
T
1
0
TCLK
G
A
T
E
0
C
T
0
/
M
T
0
1
M
T
0
0
(5 bits)
TL0
(8 bits)
156), facilitating pulse width mea-
TH0
for information on selecting
TR1
TR0
TF1
TF0
IE1
IE0
IT1
IT0
Interrupt
Section