Z51F3220FNX Datasheet, PDF (187/312 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F3220
Product Specification
11.12 USI0 (UART + SPI + I2C)
11.12.1 Overview
The USI0 consists of USI0 control register1/2/3/4, USI0 status register 1/2, USI0 baud-rate generation register,
USI0 data register, USI0 SDA hold time register, USI0 SCL high period register, USI0 SCL low period register,
and USI0 slave address register (USI0CR1, USI0CR2, USI0CR3, USI0CR4, USI0ST1, USI0ST2, USI0BD,
USI0DR, USI0SDHR, USI0SCHR, USI0SCLR, USI0SAR).
The operation mode is selected by the operation mode of USI0 selection bits (USI0MS[1:0]).
It has four operating modes:
- Asynchronous mode (UART)
- Synchronous mode
- SPI mode
- I2C mode
PS029902-0212
PRELIMINARY
185