DS80C320-MCG Datasheet, PDF (23/175 Pages) Dallas Semiconductor – High-Speed Microcontroller User Guide

Timer Mode Control (TMOD)
7
6
5
SFR 89h GATE _{C/ T}
M1
RW-0 RW-0 RW-0
4
M0
RW-0
High-Speed Microcontroller User’s Guide
3
GATE
RW-0
2
C/ T
RW-0
1
M1
RW-0
0
M0
RW-0
R=Unrestricted Read, W=Unrestricted Write, -n=Value after Reset
GATE
Bit 7
C/T
Bit 6
M1, M0
Bits 5-4
Timer 1 Gate Control. This bit enable/disables the ability of Timer 1 to
increment.
0 = Timer 1 will clock when TR1=1, regardless of the state of INT .
1 = Timer 1 will clock only when TR1=1 and INT1 =1.
Timer 1 Counter/Timer Select.
0 = Timer 1 is incremented by internal clocks.
1 = Timer 1 is incremented by pulses on T1 when TR1 (TCON.6) is 1.
Timer 1 Mode Select. These bits select the operating mode of Timer 1.
M1 M0
0
0
Mode
Mode 0: 8 bits with 5-bit prescale
0
1
Mode 1: 16 bits
1
0
Mode 2: 8 bits with auto-reload
1
1
Mode 3: Timer 1 is halted, but holds its
count
GATE
Bit 3
C/ T
Bit 2
M1, M0
Bits 1-0
Timer 0 Gate Control. This bit enables/disables that ability of Timer 0 to
increment.
0 = Timer 0 will clock when TR0=1, regardless of the state of INT0 .
1 = Timer 0 will clock only when TR0=1 and INT0 =1.
Timer 0 Counter/Timer Select.
0 = Timer incremented by internal clocks.
1 = Timer 1 is incremented by pulses on T0 when TR0 (TCON.4) is 1.
Timer 0 Mode Select. These bits select the operating mode of Timer 0.
When Timer 0 is in mode 3, TL0 is started/stopped by TR0 and TH0 is
started/stopped by TR1. Run control from Timer 1 is then provided via the
Timer 1 mode selection.
M1
M0 Mode
0
0
Mode 0: 8 bits with 5-bit prescale
0
1
Mode 1: 16 bits
1
0
Mode 2: 8 bits with auto-reload
1
1
Mode 3: Timer 0 is two 8 bit counters.
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