UPD78F9234MC-5A4-A Renesas Electronics America, UPD78F9234MC-5A4-A Datasheet - Page 154

• Manufacturer Part Number: UPD78F9234MC-5A4-A
• Description: MCU 8BIT 8KB FLASH 30PIN
• Manufacturer: Renesas Electronics America
• Series: 78K0S/Kx1+r

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: -

152
Watchdog timer clock
source
Operation after reset
Operation mode
selection
Features
Notes 1.
Remarks 1. f
2.
2. f
As long as power is being supplied, low-speed internal oscillator cannot be stopped (except in the reset
period).
The conditions under which clock supply to the watchdog timer is stopped differ depending on the
clock source of the watchdog timer.
<1> If the clock source is f
<2> If the clock source is f
RL
X
: System clock oscillation frequency
: Low-speed internal oscillation clock frequency
conditions.
conditions.
Table 9-2. Option Byte Setting and Watchdog Timer Operation Mode
When f
In HALT/STOP mode
During oscillation stabilization time
If the CPU clock is f
In HALT/STOP mode
Fixed to f
Operation starts with the maximum interval (2
The interval can be changed only once.
The watchdog timer cannot be stopped.
Low-Speed Internal Oscillator Cannot Be Stopped
X
is stopped
RL
Note 1
.
CHAPTER 9 WATCHDOG TIMER
X
and if f
RL
X
User’s Manual U17446EJ5V0UD
, clock supply to the watchdog timer is stopped under the following
, clock supply to the watchdog timer is stopped under the following
RL
is stopped by software before execution of the STOP instruction
Option Byte Setting
18
/f
RL
). Operation starts with the maximum interval
(2
The clock selection/interval can be changed only
once.
The watchdog timer can be stopped
18
Low-Speed Internal Oscillator Can Be Stopped
Selectable by software (f
When reset is released: f
/f
RL
).
by Software
X
RL
, f
RL
or stopped)
Note 2
.