UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 492

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(1) SCK0 ················· Pin for inputting/outputting the serial clock
(2) SB0 ···················· Serial data input/output dual-function pin
452
The serial clock pin (SCK0) and serial data bus pin (SB0) configuration is as shown below.
As the serial data bus line output is N-ch open-drain, an external pull-up resistor is required.
• Master ··········· CMOS, push-pull output
• Slave ············· Schmitt input
······················
N-ch Open Drain
Clock Output
(Clock Input)
For both master and slave, output is N-ch open-drain, and input is Schmitt input.
SO
SI
Master Device
CHAPTER 17 CLOCKED SERIAL INTERFACE
Figure 17-10 Pin Configuration Diagram
SCK0
SB0
Serial Data Bus
Serial Clock
R
L
SCK0
SB0
N-ch Open-Drain
Slave Device
(Clock Output)
Clock Input
SO
SI