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CMX850L8 View Datasheet(PDF) - CML Microsystems Plc

Part Name
Description
MFG CO.
CMX850L8
CML
CML Microsystems Plc CML
'CMX850L8' PDF : 103 Pages View PDF
Communications Controller
TCON Register b0: Int0 type control (IT0)
b0 = 1 Int0 configured as a falling edge triggered interrupt
b0 = 0 Int0 configured as a low level triggered interrupt.
1.5.15.2
Timer/Counter Mode Register (TMOD)
TMOD: SFR Address $89
All bits reset to 0 on reset.
Bit:
7
6
5
4
3
2
1
0
Timer 1
gate
Timer 1
C/T
control
Timer 1
mode
select 1
Timer 1
mode
select 0
Timer 0
gate
Timer 0
C/T
control
Timer 0
mode
select 1
Timer 0
mode
select 0
CMX850
TMOD Register b7: Timer 1 gate
b7 = 1 Timer/Counter 1 only runs while TCON.6 (TR1) = 1 and Int1 is high (hardware control)
b7 = 0 Timer/Counter 1 only runs while TCON.6 (TR1) = 1 (software control)
TMOD Register b6: Timer 1 C/T control
b6 = 1 Counter operation (input from T1 input pin)
b6 = 0 Timer operation (input from internal system clock)
TMOD Register b5-4: Timer 1 mode select
b5 b4
0 0 13-bit timer/counter (TH1 = 8-bit counter, TL1 = 5-bit prescaler)
0 1 16-bit timer/counter
1 0 8-bit Auto-reload timer/counter (TH1 = reload value, TL1 = 8-bit counter)
1 1 Does not run
TMOD Register b3: Timer 0 gate
b3 = 1 Timer/Counter 0 only runs while TCON.4 (TR0) = 1 and Int0 is high (hardware control)
b3 = 0 Timer/Counter 0 only runs while TCON.4 (TR0) = 1 (software control)
TMOD Register b2: Timer 0 C/T control
b2 = 1 Counter operation (input from T0 to input pin)
b2 = 0 Timer operation (input from internal system clock)
TMOD Register b1-0: Timer 0 mode select
b1 b0
0 0 13-bit timer/counter (TH0 = 8-bit counter, TL0 = 5-bit prescaler
0 1 16-bit timer/counter
1 0 8-bit Auto-reload timer (TH0 = reload value, TL0 = 8-bit counter)
1 1 Two 8-bit timers, TL0 and TH0: TL0 uses timer 0 control bits, TH0 is locked into a
timer function (counting machine cycles) and takes over the use of TR1, TF1 and
the Timer 1 interrupt.
© 2003 CML Microsystems Plc
61
D/850/6
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