GMS90C3X Datasheet, PDF (24/59 Pages) Hynix Semiconductor – HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS90 Series
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
Capture
Baud Rate
Generator
Off
T2CON
T2MO
D
T2CON
P1.1/
RCLK or
TCLK
CP/RL2
TR2
T2EX
DCEN EXEN2
Remarks
Input Clock
internal
external
(P1.0/T2)
0
0
1
0 0 X reload upon over-
flow
0
0
1
0
1
↓ reload trigger (fall-
ing edge)
f_OSC ÷ 12
Max.
f_OSC ÷24
0
0
1
1 X 0 Down counting
0
0
1
1 X 1 Up counting
0
1
1
X 0 X 16 bit Timer/ Coun-
0
1
1
X
1
ter (only up-count-
ing)
↓ capture TH2,TL2
f_OSC ÷ 12
Max.
f_OSC ÷ 24
→ RC2H,RC2L
1
X
1
X 0 X no overflow
1
X
1
X
1
interrupt request
(TF2)
f_OSC ÷ 12
↓ extra external inter-
Max.
f_OSC ÷ 24
rupt ("Timer 2")
X
X
0
X X X Timer 2 stops
-
-
Note: ↓ = falling edge
20
Oct. 2000 Ver 3.1a