C8051F572-IMR Silicon Labs, C8051F572-IMR Datasheet - Page 259
C8051F572-IMR
Manufacturer Part Number
C8051F572-IMR
Description
8-bit Microcontrollers - MCU 50 MIPS 16 kB 2 kB CAN2.0 LIN 2.1 SPI
Manufacturer
Silicon Labs
Datasheet
1.C8051F556-IMR.pdf
(302 pages)
Specifications of C8051F572-IMR
Rohs
yes
Core
8051
Data Bus Width
8 bit
Processor Series
C8051
- Current page: 259 of 302
- Download datasheet (2Mb)
25.1.4. Mode 3: Two 8-bit Counter/Timers (Timer 0 Only)
In Mode 3, Timer 0 is configured as two separate 8-bit counter/timers held in TL0 and TH0. The coun-
ter/timer in TL0 is controlled using the Timer 0 control/status bits in TCON and TMOD: TR0, C/T0, GATE0
and TF0. TL0 can use either the system clock or an external input signal as its timebase. The TH0 register
is restricted to a timer function sourced by the system clock or prescaled clock. TH0 is enabled using the
Timer 1 run control bit TR1. TH0 sets the Timer 1 overflow flag TF1 on overflow and thus controls the
Timer 1 interrupt.
Timer 1 is inactive in Mode 3. When Timer 0 is operating in Mode 3, Timer 1 can be operated in Modes 0,
1 or 2, but cannot be clocked by external signals nor set the TF1 flag and generate an interrupt. However,
the Timer 1 overflow can be used to generate baud rates for the SMBus and/or UART, and/or initiate ADC
conversions. While Timer 0 is operating in Mode 3, Timer 1 run control is handled through its mode set-
tings. To run Timer 1 while Timer 0 is in Mode 3, set the Timer 1 Mode as 0, 1, or 2. To disable Timer 1,
configure it for Mode 3.
/INT0
T0
Crossbar
Pre-scaled Clock
SYSCLK
IN0PL
GATE0
XOR
Figure 25.2. T0 Mode 2 Block Diagram
0
1
TR0
M
H
T
3
M
T
3
L
CKCON
M
H
T
2
M
T
2
L
0
1
M
T
1
M
T
0
S
C
A
1
Rev. 1.1
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
C8051F55x/56x/57x
(8 bits)
(8 bits)
TH0
TL0
N
P
1
L
I
N
1
S
L
2
I
IT01CF
N
S
1
L
1
I
N
S
1
L
0
I
N
0
P
L
I
Reload
N
S
0
L
2
I
N
S
0
L
1
I
N
0
S
L
0
I
TR1
TR0
TF1
TF0
IE1
IE0
IT1
IT0
Interrupt
259
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