C504 Datasheet, PDF (21/49 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

C504
Timer 2
Timer 2 is a 16-bit Timer/Counter with an up/down count feature. It can operate either as timer or as
an event counter which is selected by bit C/T2 (T2CON.1). It has three operating modes as shown
in table 5.
Table 5
Timer/Counter 2 Operating Modes
Mode
16-bit
Auto-
reload
16-bit
Cap-
ture
Baud
Rate
Gene-
rator
off
T2CON
R×CLK
or
T×CLK
CP/
RL2
0
0
0
0
0
0
0
0
0
1
0
1
1
X
1
X
X
X
T2MOD T2CON
TR2
DCEN
P1.1/
T2EX
Remarks
EXEN
Input Clock
internal
external
(P1.0/T2)
1
0
1
0
1
1
1
1
1
X
1
X
1
X
1
X
0
X
0
X reload upon
overflow
1
↓ reload trigger
(falling edge)
f_OSC/12
max
f_OSC/24
X
0 Down counting
X
1 Up counting
0
X 16 bit Timer/
Counter (only
1
up-counting)
↓ capture TH2,
f_OSC/12
max
f_OSC/24
TL2 → RC2H,
RC2L
0
X no overflow
interrupt
1
request (TF2)
↓ extra external
f_OSC/2
max
f_OSC/24
interrupt
(“Timer 2”)
X
X Timer 2 stops
–
–
Note: ↓ =
falling edge
Semiconductor Group
21