HMS99C52 Datasheet, PDF (23/43 Pages) Hynix Semiconductor – 8-BIT SINGLE-CHIP MICROCONTROLLERS

HMS99C5X 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
T2CON
RCLK or
TCLK
CP/RL2
16-bit Auto- 0
0
Reload
0
0
0
0
0
0
16-bit
0
1
Capture
0
1
Baud Rate 1
X
Generator
1
X
Off
X
X
T2MOD T2CON
P1.1/
TR2 DCEN EXEN2 ^T2EX
Remarks
1
0
0
X reload upon over-
flow
1
0
1
↓ reload trigger (fall-
ing edge)
1
1
X
0 Down counting
1
1
X
1 Up counting
1
X
0
X 16 bit Timer/ Coun-
ter (only up-count-
ing)
1
X
1
↓ capture TH2,TL2
→ RC2H,RC2L
1
X
0
X no overflow
interrupt request
(TF2)
1
X
1
↓ extra external inter-
rupt ("Timer 2")
0 X X X Timer 2 stops
Input Clock
internal
external
(P1.0/T2)
f_OSC ÷ 12
Max.
f_OSC ÷24
f_OSC ÷ 12
Max.
f_OSC ÷ 24
f_OSC ÷ 12
Max.
f_OSC ÷ 24
-
-
Note: ↓ = falling edge
Jan. 2003 Ver 1.0
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