upd78f0103 Renesas Electronics Corporation., upd78f0103 Datasheet - Page 324
upd78f0103
Manufacturer Part Number
upd78f0103
Description
8-bit Single-chip Microcontrollers
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0103.pdf
(485 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
upd78f0103HMC-5A4-A
Manufacturer:
NEC
Quantity:
20 000
Company:
Part Number:
upd78f0103M6MC-5A4
Manufacturer:
NEC
Quantity:
312
- Current page: 324 of 485
- Download datasheet (4Mb)
18.4 Cautions for Power-on-Clear Circuit
voltage (V
release of reset to the start of the operation of the microcontroller can be arbitrarily set by taking the following action.
<Action>
software counter that uses a timer, and then initialize the ports.
324
Note 1
If supply voltage fluctuation is 50 ms or less in vicinity of POC detection voltage
In a system where the supply voltage (V
After releasing the reset signal, wait for the supply voltage fluctuation period of each system by means of a
Notes 1.
POC
2.
), the system may be repeatedly reset and released from the reset status. In this case, the time from
No
If reset is generated again during this period, initialization processing is not started.
A flowchart is shown on the next page.
Figure 18-3. Example of Software Processing After Release of Reset (1/2)
50 ms has passed?
Check stabilization
Change CPU clock
Checking cause
(TMIFH1 = 1?)
(set to 50 ms)
of oscillation
of reset
Initialization
processing
Start timer
Reset
Power-on-clear
Yes
Note 2
CHAPTER 18 POWER-ON-CLEAR CIRCUIT
DD
User’s Manual U15836EJ5V0UD
) fluctuates for a certain period in the vicinity of the POC detection
; The
;
;
;
;
;
;
The cause of reset (power-on-clear, WDT, LVI, or clock monitor)
can be identified by the RESF register.
8-bit timer H1 can operate with the Ring-OSC clock.
Source: f
(f
Check the stabilization of oscillation of the X1 input clock by using the
OSTC register.
Change the CPU clock from the Ring-OSC clock to the X1 input clock.
TMIFH1 = 1: Interrupt request is generated.
Initialization of ports
R
: Ring-OSC clock oscillation frequency)
Ring-OSC clock is set as the CPU clock when the reset signal is generated
R
(480 kHz (MAX.))/2
7
compare value 200 = 53 ms
Related parts for upd78f0103
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Renesas Technology Corp [Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series]
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
RENESAS MCU M16C FAMILY / M16C/Tiny SERIES
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Renesas Starter Kit for RX210
Manufacturer:
Renesas Electronics Corporation.
Part Number:
Description:
EVALBOARD/Renesas StarterKit for RX630
Manufacturer:
Renesas Electronics Corporation.
Part Number:
Description:
EVALBOARD/Renesas Starter Kit+ for RX63N
Manufacturer:
Renesas Electronics Corporation.
Part Number:
Description:
EVALBOARD/Renesas Starter Kit
Manufacturer:
Renesas Electronics Corporation.
Part Number:
Description:
FLASH PROGRAMMER FOR RENESAS MICROCONTROLLERS
Manufacturer:
Renesas Electronics Corporation.
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet: