mpc89x51a Megawin Technology, mpc89x51a Datasheet - Page 16

• Manufacturer Part Number: mpc89x51a
• Description: 8-bit Micro-controller
• Manufacturer: Megawin Technology

C/T2: Timer or counter select. 0 is for timer and 1 is for external event counter.
CP/RL2: Capture/Reload flag. When set, captures will occurs on a negative transition at T2EX if
TIMER0 (T0) AND TIMER1 (T1)
Mode 0
The timer register is configured as a 13-bits register. As when the count rolls over from all 1s to
all 0s, it sets the timer interrupt flag TFx. The counted input is enabled to the timer when TRx =
1 and either GATE=0 or INTx = 1. Mode 0 operation is the same for Timer0 and Timer1.
Mode 1
Mode1 is the same as Mode0, except that the timer register is being run with all 16 bits.
Mode 2
Mode 2 configures the timer register as an 8-bits counter (TLx) with automatic reload.
Overflow from TLx does not only set TFx, but also reloads TLx with the content of THx, which
is determined by user’s program. The reload leaves THx unchanged. Mode 2 operation is the
same for Timer0 and Timer1.
16
T0 or T1 pin
(sampled)
T0 or T1 pin
(sampled)
OSC/12
OSC/12
/INTx
GATE
/INTx
GATE
C//T
C//T
EXEN2=1. When cleared, auto-reloads will occur either with Timer2 overflows or a negative
transition at T2EX when EXEN2=1. When whether TCLK or RCLK is 1, this bits is ignored and
the timer is forced to auto-reload on Timer2 overflow.
0
1
0
1
TRx
TRx
MPC89x51A Data Sheet
0
1
0
1
TLx[7:0] THx[7:0]
TLx[4:0] THx[7:0]
TFx
TFx
MEGAWIN
Mode 1
Mode 0
Interrupt
Interrupt