UPD78F1506GF-GAT-AX Renesas Electronics America, UPD78F1506GF-GAT-AX Datasheet - Page 617
UPD78F1506GF-GAT-AX
Manufacturer Part Number
UPD78F1506GF-GAT-AX
Description
MCU 16BIT 78K0R/LX3 128-LQFP
Manufacturer
Renesas Electronics America
Series
78K0R/Lx3r
Datasheet
1.UPD78F1500GK-GAK-AX.pdf
(1016 pages)
Specifications of UPD78F1506GF-GAT-AX
Core Processor
78K/0R
Core Size
16-Bit
Speed
20MHz
Connectivity
3-Wire SIO, I²C, LIN, UART/USART
Peripherals
DMA, LCD, LVD, POR, PWM, WDT
Number Of I /o
78
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 12x12b, D/A 2x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
- Current page: 617 of 1016
- Download datasheet (7Mb)
78K0R/Lx3
R01UH0004EJ0401 Rev.4.01
Jul 2, 2010
15.5.14 Communication reservation
(1) When communication reservation function is enabled (bit 0 (IICRSV) of IICA flag register (IICF) = 0)
To start master device communications when not currently using a bus, a communication reservation can be made
to enable transmission of a start condition when the bus is released. There are two modes under which the bus is
not used.
• When arbitration results in neither master nor slave operation
• When an extension code is received and slave operation is disabled (ACK is not returned and the bus was
If bit 1 (STT) of IICCTL0 is set to 1 while the bus is not used (after a stop condition is detected), a start condition is
automatically generated and wait state is set.
If an address is written to the IICA shift register (IICA) after bit 4 (SPIE) of IICCTL0 was set to 1, and it was
detected by generation of an interrupt request signal (INTIICA) that the bus was released (detection of the stop
condition), then the device automatically starts communication as the master. Data written to IICA before the stop
condition is detected is invalid.
When STT has been set to 1, the operation mode (as start condition or as communication reservation) is
determined according to the bus status.
• If the bus has been released ........................................ a start condition is generated
• If the bus has not been released (standby mode)......... communication reservation
Check whether the communication reservation operates or not by using MSTS (bit 7 of the IICA status register
(IICS)) after STT is set to 1 and the wait time elapses.
Use software to secure the wait time calculated by the following expression.
released by setting bit 6 (LREL) of IICA control register 0 (IICCTL0) to 1 and saving communication).
Remark IICWL: IICA low-level width setting register
Wait time from setting STT = 1 to checking the MSTS flag:
(IICWL setting value + IICWH setting value + 4 clocks) / f
IICWH: IICA high-level width setting register
t
f
F
CLK
:
:
SDA0 and SCL0 signal falling times
CPU/peripheral hardware clock frequency
CLK
CHAPTER 15 SERIAL INTERFACE IICA
+ t
F
× 2
617
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