71M6521FE-IMR/F Maxim Integrated Products, 71M6521FE-IMR/F Datasheet - Page 26
71M6521FE-IMR/F
Manufacturer Part Number
71M6521FE-IMR/F
Description
IC ENERGY METER 32K FLASH 68-QFN
Manufacturer
Maxim Integrated Products
Specifications of 71M6521FE-IMR/F
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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In counter mode, the register is incremented when the falling edge is observed at the corresponding input signal T0
or T1 (T0 and T1 are the timer gating inputs derived from certain DIO pins, see the DIO Ports chapter). Since it takes
2 machine cycles to recognize a 1-to-0 event, the maximum input count rate is 1/2 of the oscillator frequency. There
are no restrictions on the duty cycle, however to ensure proper recognition of 0 or 1 state, an input should be stable
for at least 1 machine cycle.
The timers/counters are controlled by the TCON Register
Timer/Counter Control Register (TCON)
Page: 26 of 107
TCON.7
TCON.6
TCON.5
TCON.4
TCON.3
TCON.2
TCON.1
TCON.0
Bit
MSB
TF1
Symbol
TF1
TR1
TF0
TR0
IE1
IT1
IE0
IT0
TR1
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 20: The TCON Register Bit Functions
TF0
Table 19: The TCON Register
TR0
IE1
IT1
IE0
71M6521DE/DH/FE Data Sheet
IT0
LSB
Rev 2
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