80C186EC/80C188EC Microprocessor User's Manual

TIMER/COUNTER UNIT
Register Name:
Register Mnemonic:
Register Function:
Timer 0 and 1 Control Registers
T0CON, T1CON
Defines Timer 0 and 1 operation.
15 0
E
N
I
N
H
I
N
T
R
I
U
M
C
R
T
G
P
E
X
T
A
L
T
C
O
N
T
A1297-0A
Bit
Mnemonic
Bit Name
Reset
State
Function
EN Enable 0 Set to enable the timer. This bit can be written only
when the INH bit is set.
INH Inhibit X Set to enable writes to the EN bit. Clear to ignore
writes to the EN bit. The INH bit is not stored; it
always reads as zero.
INT Interrupt X Set to generate an interrupt request when the Count
register equals a Maximum Count register. Clear to
disable interrupt requests.
RIU
Register In
Use
X
Indicates which compare register is in use. When set,
the current compare register is Maxcount Compare B;
when clear, it is Maxcount Compare A.
MC
Maximum
Count
X
This bit is set when the counter reaches a maximum
count. The MC bit must be cleared by writing to the
Timer Control register. This is not done automatically.
If MC is clear, the counter has not reached a
maximum count.
NOTE:
Reserved register bits are shown with gray shading. Reserved bits must be written to a
logic zero to ensure compatibility with future Intel products.
Figure 9-5. Timer 0 and Timer 1 Control Registers
9-7