78M6612 Maxim, 78M6612 Datasheet - Page 15

• Manufacturer Part Number: 78M6612
• Description: The Teridian™ 78M6612 is a highly integrated, single-phase, power and energy measurement and monitoring system-on-chip (SoC) that includes a 32-bit compute engine (CE), an MPU core, RTC, and flash
• Manufacturer: Maxim

DS_6612_001
Additionally, if DIO6 and DIO7 are declared outputs, they can be configured as dedicated pulse outputs
(WPULSE = DIO6, VARPULSE = DIO7) using DIO_PW and DIO_PV registers. In this case, DIO6 and
DIO7 are under CE control. DIO4 and DIO5 can be configured to implement the EEPROM Interface.
If the optical UART is not used, TX1 and RX1 can be configured as dedicated DIO pins (DIO1, DIO2, see
Section 1.5.6 Optical
A 3-bit configuration word, I/O RAM register, DIO_Rx (0x2009[2:0] through 0x200E[6:4]) can be used for
certain pins, when configured as DIO, to individually assign an internal resource such as an interrupt or a
timer control (see
if they are configured as outputs.
The control resources selectable for the DIO pins are listed in
connected to the same resource, the resources are combined using a logical OR.
Rev 2
78M6612
hardware.
shown in
to the resistance of the internal switch that connects V3P3D to either V3P3SYS or VBAT.
When configured as inputs, the dual-function (DIO/SEG) pins should not be pulled above
V3P3SYS in MISSION and above VBAT in LCD and BROWNOUT modes. Doing so will
distort the LCD waveforms of the other pins. This limitation applies to any pin that can be
configured as a LCD driver.
Tracking DIO pins configured as outputs is useful for pulse counting without external
When driving LEDs, relay coils etc., the DIO pins should sink the current into ground (as
Not recommended
Table 2
Figure
V3P3SYS
V3P3SYS
DGN
DGND
D
V3P3
V3P3D
D
VBA
VBAT
T
DIO
DIO1
1
Interface).
Figure 3: Connecting an External Load to DIO Pins
3, right), not source it from V3P3D (as shown in
for DIO pins available for this option). This way, DIO pins can be tracked even
DIO Pin n Function
R
R
LE
LED
D
Table 3: DIO_DIR Control Bit
3.3V
3.3V
Input
78M6612
0
DIO_DIR [n]
Table
4. If more than one input is
Output
1
Recommended
Recommended
V3P3SYS
V3P3SYS
DIO
DIO1
1
V3P3
V3P3D
D
DGN
DGND
D
VBA
VBA
T
T
Figure
78M6612 Data Sheet
3, left). This is due
R
R
3.3V
3.3V
LE
LED
D
15