DS89C420-QCL Datasheet, PDF (19/139 Pages) Maxim Integrated Products – Ultra-High-Speed Flash Microcontroller User’s Guide

Ultra-High-Speed Flash
Microcontroller User’s Guide
Timer/Counter Control (TCON)
7
6
5
SFR 88h
TF1
TR1
TF0
RW-0
RW-0
RW-0
R = Unrestricted read, W = Unrestricted write, -n = Value after reset
4
TR0
RW-0
3
IE1
RW-0
2
IT1
RW-0
1
IE0
RW-0
0
IT0
RW-0
TF1
Bit 7
TR1
Bit 6
TF0
Bit 5
TR0
Bit 4
IE1
Bit 3
IT1
Bit 2
IE0
Bit 1
IT0
Bit 0
Timer 1 Overflow Flag. This bit indicates when Timer 1 overflows its maximum count as defined
by the current mode. This bit can be cleared by software and is automatically cleared when the
CPU vectors to the Timer 1 interrupt service routine.
0 = No Timer 1 overflow has been detected.
1 = Timer 1 has overflowed its maximum count.
Timer 1 Run Control. This bit enables/disables the operation of Timer 1.
0 = Timer 1 is halted.
1 = Timer 1 is enabled.
Timer 0 Overflow Flag. This bit indicates when Timer 0 overflows its maximum count as defined
by the current mode. This bit can be cleared by software and is automatically cleared when the
CPU vectors to the Timer 0 interrupt service routine or by software.
0 = No Timer 0 overflow has been detected.
1 = Timer 0 has overflowed its maximum count.
Timer 0 Run Control. This bit enables/disables the operation of Timer 0.
0 = Timer 0 is halted.
1 = Timer 0 is enabled.
Interrupt 1 Edge Detect. This bit is set when an edge/level of the type defined by IT1 is detected.
If IT1 = 1, this bit remains set until cleared in software or until the start of the External Interrupt 1
service routine. If IT1 = 0, this bit inversely reflects the state of the INT1 pin.
Interrupt 1 Type Select. This bit selects whether the INT1 pin detects edge- or level-triggered
interrupts.
0 = INT1 is level triggered.
1 = INT1 is edge triggered.
Interrupt 0 Edge Detect. This bit is set when an edge/level of the type defined by IT0 is detected.
If IT0 = 1, this bit remains set until cleared in software or until the start of the External Interrupt 0
service routine. If IT0 = 0, this bit inversely reflects the state of the INT0 pin.
Interrupt 0 Type Select. This bit selects whether the INT0 pin detects edge- or level-triggered
interrupts.
0 = INT0 is level triggered.
1 = INT0 is edge triggered.
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