UPD784035YGC NEC, UPD784035YGC Datasheet - Page 44

• Manufacturer Part Number: UPD784035YGC
• Description: 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS
• Manufacturer: NEC

7.9
can also be used as a 1-bit port.
multiplexed.
44
(1) 3-wire serial I/O mode
(2) 2-wire serial I/O mode
(3) I
The operating clock of the CPU can be divided and output to an external device. The pin that outputs the clock
When this function is used, the local bus interface cannot be used because the ASTB and CLKOUT pins are
Clock Output Function
This mode is to communicate with devices having the conventional clocked serial interface.
Basically, communication is established in this mode with three lines: one serial clock (SCK0) and two serial
data (SI0 and SO0) lines.
Generally, a handshake line is necessary to check the communication status.
This mode is to transfer 8-bit data by using two lines: serial clock (SCL) and serial data bus (SDA).
Generally, a handshake line is necessary to check the communication status.
This mode is to communicate with devices conforming to the I
This mode is to transfer 8-bit data with two or more devices by using two lines: serial clock (SCL) and serial
data bus (SDA).
During transfer, a “start condition”, “data”, and “stop condition” can be output onto the serial data bus. During
reception, these data can be automatically detected by hardware.
2
C (Inter IC) bus mode
f
f
f
f
f
CLK
CLK
CLK
CLK
CLK
Figure 7-13. Block Diagram of Clock Output Function
/2
/4
/8
/16
Output enable
PD784035Y, 784036Y, 784037Y, 784038Y
Output
control
Output level
2
C bus format.
CLKOUT