UPD78F9234MC-5A4-A Renesas Electronics America, UPD78F9234MC-5A4-A Datasheet - Page 83

• 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: -

5.5
oscillators.
OPTION BYTE.
(1) High-speed internal oscillator
A clock (f
The system clock oscillator is selected by the option byte. For details of the option byte, refer to CHAPTER 18
Note Operation stop time is 277 s (MIN.), 544 s (TYP.), and 1.075 ms (MAX.).
When the high-speed internal oscillation is selected by the option byte, the following is possible.
Figures 5-8 and 5-9 show the timing chart and status transition diagram of the default start by the high-speed
internal oscillation.
Remark When the high-speed internal oscillation is used, the clock accuracy is 5%.
High-speed internal oscillator:
Crystal/ceramic oscillator:
External clock input circuit:
Operation of CPU Clock Generator
Shortening of start time
If the high-speed internal oscillator is selected as the oscillator, the CPU can be started without having to wait
for the oscillation stabilization time of the system clock. Therefore, the start time can be shortened.
Improvement of expandability
If the high-speed internal oscillator is selected as the oscillator, the X1 and X2 pins can be used as I/O port
pins. For details, refer to CHAPTER 4 PORT FUNCTIONS.
System clock
Internal reset
CPU
CPU clock
) is supplied to the CPU from the system clock (f
RESET
Figure 5-8. Timing Chart of Default Start by High-Speed Internal Oscillation
V
DD
H
(a)
System clock is selected.
Internally oscillates a clock of 8 MHz (TYP.).
Oscillates a clock of 2 to 10 MHz.
Supplies a clock of 2 to 10 MHz to X1 pin.
(Operation stops
CHAPTER 5 CLOCK GENERATORS
Option byte is read.
User’s Manual U17446EJ5V0UD
Note
)
(b)
X
) oscillated by one of the following three types of
High-speed internal oscillation clock
PCC = 02H, PPCC = 02H
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