HD64F3687GH Renesas Electronics America, HD64F3687GH Datasheet - Page 326
HD64F3687GH
Manufacturer Part Number
HD64F3687GH
Description
IC H8 MCU FLASH 56K 64-QFP
Manufacturer
Renesas Electronics America
Series
H8® H8/300H Tinyr
Datasheet
1.HD64F3684GFPV.pdf
(538 pages)
Specifications of HD64F3687GH
Core Processor
H8/300H
Core Size
16-Bit
Speed
20MHz
Connectivity
I²C, SCI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
45
Program Memory Size
56KB (56K x 8)
Program Memory Type
FLASH
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
64-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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Section 16 Serial Communication Interface 3 (SCI3)
16.6
Multiprocessor Communication Function
Use of the multiprocessor communication function enables data transfer between a number of
processors sharing communication lines by asynchronous serial communication using the
multiprocessor format, in which a multiprocessor bit is added to the transfer data. When
multiprocessor communication is performed, each receiving station is addressed by a unique ID
code. The serial communication cycle consists of two component cycles; an ID transmission cycle
that specifies the receiving station, and a data transmission cycle. The multiprocessor bit is used to
differentiate between the ID transmission cycle and the data transmission cycle. If the
multiprocessor bit is 1, the cycle is an ID transmission cycle; if the multiprocessor bit is 0, the
cycle is a data transmission cycle. Figure 16.15 shows an example of inter-processor
communication using the multiprocessor format. The transmitting station first sends the ID code
of the receiving station with which it wants to perform serial communication as data with a 1
multiprocessor bit added. It then sends transmit data as data with a 0 multiprocessor bit added.
When data with a 1 multiprocessor bit is received, the receiving station compares that data with its
own ID. The station whose ID matches then receives the data sent next. Stations whose IDs do not
match continue to skip data until data with a 1 multiprocessor bit is again received.
The SCI3 uses the MPIE bit in SCR3 to implement this function. When the MPIE bit is set to 1,
transfer of receive data from RSR to RDR, error flag detection, and setting the SSR status flags,
RDRF, FER, and OER, to 1, are inhibited until data with a 1 multiprocessor bit is received. On
reception of a receive character with a 1 multiprocessor bit, the MPBR bit in SSR is set to 1 and
the MPIE bit is automatically cleared, thus normal reception is resumed. If the RIE bit in SCR3 is
set to 1 at this time, an RXI interrupt is generated.
When the multiprocessor format is selected, the parity bit setting is rendered invalid. All other bit
settings are the same as those in normal asynchronous mode. The clock used for multiprocessor
communication is the same as that in normal asynchronous mode.
Rev.5.00 Nov. 02, 2005 Page 292 of 500
REJ09B0027-0500
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