78M6612-IMR/F/PD2 Maxim Integrated Products, 78M6612-IMR/F/PD2 Datasheet - Page 24
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78M6612-IMR/F/PD2
Manufacturer Part Number
78M6612-IMR/F/PD2
Description
Current & Power Monitors & Regulators 2 Out Sgl Phase Pwr & Energy Msrmt IC
Manufacturer
Maxim Integrated Products
Datasheet
1.78M6612-IMF.pdf
(111 pages)
Specifications of 78M6612-IMR/F/PD2
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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78M6612 Data Sheet
1.4.5 Instruction Set
All instructions of the generic 8051 microcontroller are supported. A complete list of the instruction set
and of the associated op-codes is contained in the Teridian 78M6612 Firmware Developer’s Manual.
1.4.6 UARTs
The 78M6612 includes a UART (UART0) that can be programmed to communicate with a variety of
external devices. A second UART (UART1) is connected to the optical port, as described in
1.5.6 Optical
The UARTs are dedicated 2-wire serial interfaces, which can communicate with an external device at up
to 38,400 bits/s. The operation of each pin is as follows:
•
•
The 78M6612 has several UART-related registers for the control and buffering of serial data.
The serial buffers consist of sets of two separate registers (one set for each UART), a transmit buffer (S0BUF,
S1BUF) and a receive buffer (R0BUF, R1BUF). Writing data to the transmit buffer starts the transmission by the
associated UART. Received data are available by reading from the receive buffer. Both UARTs can simultaneously
transmit and receive data.
WDCON[7]
grammable for parity enable, parity, 2 stop bits/1 stop bit and XON/XOFF options for variable
communication baud rates from 300 to 38,400 bps.
Table 12
S0REL and S1REL are 10-bit values derived by combining bits from the respective timer reload registers.
SMOD is the SMOD bit in the SFR PCON. TH1
24
input LSB first.
UART RX: Serial input data are applied at this pin. Conforming to RS-232 standard, the bytes are
UART TX: This pin is used to output the serial data. The bytes are output LSB first.
Mode 0
Mode 1
Mode 2
Mode 3
UART 0
UART 1
shows the selectable UART operation modes.
selects whether timer 1 or the internal baud rate generator is used.
Interface.
UART 0
N/A
Start bit, 8 data bits, stop bit, variable
baud rate (internal baud rate generator
or timer 1).
Start bit, 8 data bits, parity, stop bit,
fixed baud rate 1/32 or 1/64 of f
Start bit, 8 data bits, parity, stop bit,
variable baud rate (internal baud rate
generator or timer 1).
2
SMOD
* f
(WDCON[7]
CKMPU
Using Timer 1
Table 11: Baud Rate Generation
/ (384 * (256-TH1))
N/A
Table 12: UART Modes
= 0)
is the high byte of timer 1.
CKMPU.
Table 11
Using Internal Baud Rate Generator
2
UART 1
Start bit, 8 data bits, parity, stop bit,
variable baud rate (internal baud rate
generator).
Start bit, 8 data bits, stop bit, variable
baud rate (internal baud rate
generator).
N/A
N/A
SMOD
shows how the baud rates are calculated.
f
CKMPU
* f
(
CKMPU
WDCON[7]
/(32 * (2
All UART transfers are pro-
/(64 * (2
10
-S1REL))
= 1)
10
-S0REL))
DS_6612_001
Section
Rev. 1.2
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