Master/Slave Mode Communication Function (Multiprocessor Mode); Fig. 12.20 Setting Of Operation Mode 1 For Uart1; Fig. 12.21 Example Of Master/Slave Mode Communication Connection For Uart - Fujitsu MB90420/5 (A) Series Hardware Manual

F2mc-16lx family 16-bit microcontrollers

Table of Contents

12.7.4 Master/Slave Mode Communication Function (Multiprocessor Mode)

The UART can perform communications using multi-CPU master/slave moe connection and use operation

mode 1. However, it can only be used as the master.

n Master/slave moe communication function

To operate the UART in multiprocessor mode (operation mode 1), the setting in Figure 12.20 is required.

bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9

: Set DDR0: bit 3, bit 5 at using UART0

¥ : Used bit

× : Unused bit

∆ : Set 0 when using input of pin.

• Inter-CPU connection

As shown in Figure 2.21, the communication system is composed by connecting the master CPU and

plural slave CPUs to two common communications lines. UART1 can only be used as the master CPU.

FRE RDRF TDRE BDS

Transmit data set (at writing) / Receive data held (at

bit 4 bit 3 bit 2