UPD78F9234MC-5A4-A Renesas Electronics America, UPD78F9234MC-5A4-A Datasheet - Page 157
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UPD78F9234MC-5A4-A
Manufacturer Part Number
UPD78F9234MC-5A4-A
Description
MCU 8BIT 8KB FLASH 30PIN
Manufacturer
Renesas Electronics America
Series
78K0S/Kx1+r
Datasheet
1.UPD78F9232MC-5A4-A.pdf
(419 pages)
Specifications of UPD78F9234MC-5A4-A
Core Processor
78K0S
Core Size
8-Bit
Speed
10MHz
Connectivity
LIN, UART/USART
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
24
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Data Converters
A/D 4x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
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Manufacturer
Quantity
Price
Company:
Part Number:
UPD78F9234MC-5A4-A
Manufacturer:
MAXIM
Quantity:
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Part Number:
UPD78F9234MC-5A4-A
Manufacturer:
NEC
Quantity:
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(2) Watchdog timer enable register (WDTE)
Address: FF49H
Symbol
WDTE
Writing ACH to WDTE clears the watchdog timer counter and starts counting again.
This register can be set by an 8-bit memory manipulation instruction.
Generation of reset signal sets this register to 9AH.
Cautions 1. Set bits 7, 6, and 5 to 0, 1, and 1, respectively. Do not set the other values.
Remarks 1. f
Cautions 1. If a value other than ACH is written to WDTE, an internal reset signal is generated.
7
After reset: 9AH
2. After reset is released, WDTM can be written only once by an 8-bit memory
3. WDTM cannot be set by a 1-bit memory manipulation instruction.
4. When using the flash memory programming by self programming, set the overflow
2. f
3.
4. Figures in parentheses apply to operation at f
2. If a 1-bit memory manipulation instruction is executed for WDTE, an internal reset
3. The value read from WDTE is 9AH (this differs from the written value (ACH)).
Figure 9-3. Format of Watchdog Timer Enable Register (WDTE)
RL
X
manipulation instruction. If writing is attempted a second time, an internal reset
signal is generated. However, at the first write, if “1” and “x” are set for WDCS4 and
WDCS3 respectively and the watchdog timer is stopped, then the internal reset
signal does not occur even if the following are executed.
time for the watchdog timer so that enough overflow time is secured (Example 1-
byte writing: 200 s MIN., 1-block deletion: 10 ms MIN.).
signal is generated.
: Don’t care
: System clock oscillation frequency
: Low-speed internal oscillation clock frequency
Second write to WDTM
1-bit memory manipulation instruction to WDTE
Writing of a value other than “ACH” to WDTE
6
R/W
5
CHAPTER 9 WATCHDOG TIMER
User’s Manual U17446EJ5V0UD
4
3
RL
= 480 kHz (MAX.), f
2
1
X
= 10 MHz.
0
155
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