71M6511-IGT/F Maxim Integrated Products, 71M6511-IGT/F Datasheet - Page 32

• Manufacturer Part Number: 71M6511-IGT/F
• Description: IC ENERGY METER RESIDENT 64-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of 71M6511-IGT/F

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Timer/Counter Control Register (TCON)
Interrupt Request register (IRCON)
Note: Only TF0 and TF1 (timer 0 and timer 1 overflow flag) will be automatically cleared by hardware when the service routine
is called (Signals T0ACK and T1ACK – port ISR – active high when the service routine is called).
External Interrupts
The external interrupts are connected as shown in Table 44. The polarity of interrupts 2 and 3 is programmable in the MPU.
Interrupts 2 and 3 should be programmed for falling sensitivity. The generic 8051 MPU literature states that interrupts 4
through 6 are defined as rising edge sensitive. Thus, the hardware signals attached to interrupts 5 and 6 are inverted to
achieve the edge polarity shown in Table 44.
SFR (special function register) enable bits must be set to permit any of these interrupts to occur. Likewise, each interrupt has
its own flag bit that is set by the interrupt hardware and is reset automatically by the MPU interrupt handler (0 through 5).
Page: 32 of 98
IRCON.7
IRCON.6
IRCON.5
IRCON.4
IRCON.3
IRCON.2
IRCON.1
IRCON.0
TCON.7
TCON.6
TCON.5
TCON.4
TCON.3
TCON.2
TCON.1
TCON.0
Bit
Bit
A Maxim Integrated Products Brand
MSB
MSB
Symbol
Symbol
IEX6
IEX5
IEX4
IEX3
IEX2
TF1
TR1
TF0
TR0
IE1
IE0
IT1
IT0
-
-
-
TF1
Timer 1 overflow flag
Not used for interrupt control
Timer 0 overflow flag
Not used for interrupt control
External interrupt 1 flag
External interrupt 1 type control bit
External interrupt 0 flag
External interrupt 0 type control bit
External interrupt 6 edge flag
External interrupt 5 edge flag
External interrupt 4 edge flag
External interrupt 3 edge flag
External interrupt 2 edge flag
Function
Function
TR1
© 2005–2010 Teridian Semiconductor Corporation
EX6
Table 43: The IRCON Bit Functions
Table 41: The TCON Bit Functions
TF0
Table 42: The IRCON Register
Table 40: The TCON Register
IEX5
TR0
IEX4
Single-Phase Energy Meter IC
IE1
71M6511/71M6511H
IT1
IEX3
DATA SHEET
IE0
IEX2
LSB
LSB
IT0
NOVEMBER 2010
V2.7