p80cl580 NXP Semiconductors, p80cl580 Datasheet - Page 19

• Manufacturer Part Number: p80cl580
• Description: Low Voltage 8-bit Microcontrollers With Uart, I2c-bus And Adc
• Manufacturer: NXP Semiconductors

Philips Semiconductors
11.3
Table 2 Timer/Counter 2 Control Register (SFR address C8H)
Table 3 Description of T2CON bits.
Table 4 Timer 2 operating modes; X = don’t care.
1997 Mar 14
Low voltage 8-bit microcontrollers with
UART, I
RTCLK
TF2
BIT
X
7
7
6
5
4
3
2
1
0
0
0
1
Timer/Counter 2 Control Register (T2CON)
2
C-bus and ADC
SYMBOL
CP/RL2
CP/RL2
RTCLK
EXEN2
EXF2
EXF2
C/T2
GF2
TR2
TF2
X
X
6
0
1
Timer 2 overflow flag. Set by a Timer 2 overflow and must be cleared by software. TF2
will not be set when RTCLK = 1.
Timer 2 external flag. Set when either a capture or reload is caused by a negative
transition on T2EX and when EXEN2 = 1. When Timer T2 interrupt is enabled,
EXF2 = 1 will cause the CPU to vector to Timer 2 interrupt routine. EXF2 must be
cleared by software.
General purpose flag bit.
Receive/transmit clock flag. When set, causes the UART serial port to use Timer 2
overflow pulses for its receive and transmit clock in Modes 1 and 3. RTCLK = 0 causes
Timer 1 overflows to be used for the receive and transmit clock.
Timer 2 external enable flag. When set, allows a capture or reload to occur as a result
of a negative transition on T2EX, if Timer 2 is not being used to clock the serial port.
EXEN2 = 0, causes Timer 2 to ignore events at T2EX.
Start/stop control for Timer 2. TR2 = 1 starts the timer.
Timer or counter select for Timer 2. C/T2 = 0 selects the internal timer with a clock
frequency of
triggered.
Capture/Reload flag. When set, captures will occur on negative transitions at T2EX, if
EXEN2 = 1. When cleared, auto-reloads will occur either with Timer 2 overflows or
negative transitions at T2EX when EXEN2 = 1. When RTCLK = 1, this bit is ignored and
the timer is forced to auto-reload on a Timer 2 overflow.
GF2
TR2
5
1
1
1
0
1
12
16-bit Auto-reload
16-bit Capture
Baud Rate Generator
Off
RTCLK
f
osc
4
. C/T2 = 1 selects the external event counter; negative edge
19
EXEN2
3
DESCRIPTION
MODE
TR2
2
P80CL580; P83CL580
C/T2
1
Product specification
CP/RL2
0