DF2148BTE20 Renesas Electronics America, DF2148BTE20 Datasheet - Page 624
DF2148BTE20
Manufacturer Part Number
DF2148BTE20
Description
IC H8S MCU FLASH 128K 100-QFP
Manufacturer
Renesas Electronics America
Series
H8® H8S/2100r
Specifications of DF2148BTE20
Core Processor
H8S/2000
Core Size
16-Bit
Speed
20MHz
Connectivity
I²C, IrDA, SCI, X-Bus
Peripherals
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)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b; D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
100-TQFP, 100-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Other names
HD64F2148BTE20
HD64F2148BTE20
HD64F2148BTE20
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DF2148BTE20V
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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Section 19 Host Interface LPC Interface (LPC)
19.4.4
The host interface can be placed in the shutdown state according to the state of the LPCPD pin.
There are two kinds of host interface shutdown state: LPC hardware shutdown and LPC software
shutdown. The LPC hardware shutdown state is controlled by the LPCPD pin, while the software
shutdown state is controlled by the SDWNB bit. In both states, the host interface enters the reset
state by itself, and is no longer affected by external signals other than the LRESET and LPCPD
signals.
Placing the slave processor in sleep mode or software standby mode is effective in reducing
current dissipation in the shutdown state. If software standby mode is set, some means must be
provided for exiting software standby mode before clearing the shutdown state with the LPCPD
signal.
If the SDWNE bit has been set to 1 beforehand, the LPC hardware shutdown state is entered at the
same time as the LPCPD signal falls, and prior preparation is not possible. If the LPC software
shutdown state is set by means of the SDWNB bit, on the other hand, the LPC software shutdown
state cannot be cleared at the same time as the rise of the LPCPD signal. Taking these points into
consideration, the following operating procedure uses a combination of LPC software shutdown
and LPC hardware shutdown.
1. Clear the SDWNE bit to 0.
2. Set the ERRIE bit to 1 and wait for an interrupt by the SDWN flag.
3. When an ERRI interrupt is generated by the SDWN flag, check the host interface internal
4. Set the SDWNB bit to 1 to set LPC software standby mode.
5. Set the SDWNE bit to 1 and make a transition to LPC hardware standby mode. The SDWNB
6. Check the state of the LPCPD signal to make sure that the LPCPD signal has not risen during
7. Place the slave processor in sleep mode or software standby mode as necessary.
8. If software standby mode has been set, exit software standby mode by some means
9. When a rising edge is detected in the LPCPD signal, the SDWNE bit is automatically cleared
Rev. 3.00 Mar 21, 2006 page 568 of 788
REJ09B0300-0300
status flags and perform any necessary processing.
bit is cleared automatically.
steps 3 to 5. If the signal has risen, clear SDWNE to 0 to return to the state in step 1.
independent of the LPC.
to 0. If the slave processor has been placed in sleep mode, the mode is exited by means of
LRESET signal input, on completion of the LPC transfer cycle, or by some other means.
Host Interface Shutdown Function (LPCPD)
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