upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 53

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

(9)
PCS0, PCS1 (Port CS) … Bi-directional I/O
Port CS is a 2-bit I/O port for which input and output can be set in 1-bit units.
An on-chip pull-up and Pull-down resistor can be specified for use in 1-bit units using pull-up/ pull-
down resistor option register CS (PUCS, PDCS).
(a) Port mode
PCS0 and PCS1 can be set to input or output in 1-bit units using port mode register CS (PMCS).
(b) Control mode
PCS0 and PCS1 can be set to control modes in 1-bit units using port mode control register CS
(PMCCS).
- CS0, CS1 (chip select input) … Input
This is the chip select signal for external SRAM, external ROM, or external peripheral I/O.
The signal CSn is assigned to memory block n (n = 0, 1).
This is active for the period during which a bus cycle that accesses the corresponding
memory block is activated. It is inactive in an idle state (TI).
User’s Manual U16702EE3V2UD00
Chapter 2 Pin Functions
53