UPD78F9234MC-5A4-A Renesas Electronics America, UPD78F9234MC-5A4-A Datasheet - Page 66

• 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: -

(3) External clock input
64
The system clock oscillation is selected by the option byte. For details, refer to CHAPTER 18 OPTION BYTE.
Generation of reset signal sets port 12 to the input mode.
Figures 4-12 and 4-13 show the block diagrams of port 12.
The P121 pin is used as the X1 pin to input an external clock, and therefore it cannot be used as an I/O port pin.
The P122 pin can be used as an I/O port pin.
PU12:
P12:
PM12:
RD:
WR
WR
WR
WR
RD
PORT
PU
PM
: Write signal
Pull-up resistor option register 12
Port register 12
Port mode register 12
Read signal
PM120, PM123
PU120, PU123
(P120, P123)
Output latch
PM12
PU12
P12
Figure 4-12. Block Diagram of P120 and P123
CHAPTER 4 PORT FUNCTIONS
User’s Manual U17446EJ5V0UD
V
DD
P-ch
P120, P123