71m6403 Teridian Semiconductor Corporation, 71m6403 Datasheet - Page 25

• Manufacturer Part Number: 71m6403
• Description: Electronic Trip Unit
• Manufacturer: Teridian Semiconductor Corporation

Note:
Timer/Counter Control Register (TCON)
Page: 25 of 75
TL0 is affected by TR0 and gate control bits, and sets TF0 flag on overflow.
TH0 is affected by TR1 bit, and sets TF1 flag on overflow.
M1
TCON.7
TCON.6
TCON.5
TCON.4
TCON.3
TCON.2
TCON.1
TCON.0
0
0
1
1
Bit
MSB
TF1
M0
0
1
0
1
Symbol
TR1
TR1
TR0
TF1
TF0
IE1
IT1
IE0
IT0
Mode 0
Mode 1
Mode2
Mode3
Mode
TF0
Function
The Timer 1 overflow flag is set by hardware when Timer 1 overflows. This flag
can be cleared by software and is automatically cleared when an interrupt is
processed.
Timer 1 Run control bit. If cleared, Timer 1 stops.
Timer 0 overflow flag set by hardware when Timer 0 overflows. This flag can be
cleared by software and is automatically cleared when an interrupt is processed.
Timer 0 Run control bit. If cleared, Timer 0 stops.
Interrupt 1 edge flag is set by hardware when the falling edge on external pin
int1 is observed. Cleared when an interrupt is processed.
Interrupt 1 type control bit. Selects either the falling edge or low level on input
pin to cause an interrupt.
Interrupt 0 edge flag is set by hardware when the falling edge on external pin
int0 is observed. Cleared when an interrupt is processed.
Interrupt 0 type control bit. Selects either the falling edge or low level on input
pin to cause interrupt.
Table 19: Timers/Counters Mode Description
Table 21: The TCON Register Bit Functions
Function
13-bit Counter/Timer with 5 lower bits in the TL0 or TL1 register and the
remaining 8 bits in the TH0 or TH1 register (for Timer 0 and Timer 1,
respectively). The 3 high order bits of TL0 and TL1 are held at zero.
16-bit Counter/Timer.
8-bit auto-reload Counter/Timer. The reload value is kept in TH0 or TH1,
while TL0 or TL1 is incremented every machine cycle. When TL(x)
overflows, a value from TH(x) is copied to TL(x).
If Timer 1 M1 and M0 bits are set to '1', Timer 1 stops. If Timer 0 M1 and M0
bits are set to '1', Timer 0 acts as two independent 8-bit Timer/Counters.
©
Table 20: The TCON Register
TR0
2006 TERIDIAN Semiconductor Corporation
IE1
IT1
IE0
Electronic Trip Unit
IT0
LSB
71M6403
SEPTEMBER 2006
REV 1.0