DF2148RTE20IV Renesas Electronics America, DF2148RTE20IV Datasheet - Page 587
DF2148RTE20IV
Manufacturer Part Number
DF2148RTE20IV
Description
MCU 5V 128K I-TEMP,PB-FREE, 100-
Manufacturer
Renesas Electronics America
Series
H8® H8S/2100r
Specifications of DF2148RTE20IV
Core Processor
H8S/2000
Core Size
16-Bit
Speed
20MHz
Connectivity
Host Interface, I²C, IrDA, SCI
Peripherals
POR, PWM, WDT
Number Of I /o
74
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
4 V ~ 5.5 V
Data Converters
A/D 8x10b; D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
100-TQFP, 100-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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16.3.11 Initialization of Internal State
The IIC has a function for forcible initialization of its internal state if a deadlock occurs during
communication.
Initialization is executed by (1) setting bits CLR3 to CLR0 in the DDCSWR register or (2)
clearing the ICE bit. For details of settings for bits CLR3 to CLR0, see section 16.2.8, DDC
Switch Register (DDCSWR).
Scope of Initialization:
The initialization executed by this function covers the following items:
The following items are not initialized:
Notes on Initialization:
TDRE and RDRF internal flags
Transmit/receive sequencer and internal operating clock counter
Internal latches for retaining the output state of the SCL and SDA pins (wait, clock, data
output, etc.)
Actual register values (ICDR, SAR, SARX, ICMR, ICCR, ICSR, DDCSWR, STCR)
Internal latches used to retain register read information for setting/clearing flags in the ICMR,
ICCR, ICSR, and DDCSWR registers
The value of the ICMR register bit counter (BC2 to BC0)
Generated interrupt sources (interrupt sources transferred to the interrupt controller)
Interrupt flags and interrupt sources are not cleared, and so flag clearing measures must be
taken as necessary.
Basically, other register flags are not cleared either, and so flag clearing measures must be
taken as necessary.
When initialization is performed by means of the DDCSWR register, the write data for bits
CLR3 to CLR0 is not retained. To perform IIC clearance, bits CLR3 to CLR0 must be written
to simultaneously using an MOV instruction. Do not use a bit-manipulation instruction such as
BCLR. Similarly, when clearing is required again, all the bits must be written to
simultaneously in accordance with the setting.
If a flag clearing setting is made during transmission/reception, the IIC module will stop
transmitting/receiving at that point and the SCL and SDA pins will be released. When
transmission/reception is started again, register initialization, etc., must be carried out as
necessary to enable correct communication as a system.
Rev. 4.00 Sep 27, 2006 page 541 of 1130
Section 16 I
2
C Bus Interface [Option]
REJ09B0327-0400
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