User guide

2: Software Development for the ICP

DC 900-1338I 47

the console port. Timer channels B and C are dedicated to hardware functions. Do not

change the configuration of the timer channels.

The MFP contains 24 byte-wide registers beginning at the MFP base address

(0x20000000). The MFP’s eight channels of external interrupt control are used to pro-

vide SCC interrupts. The MFP must be initialized appropriately before using SCC

interrupts.Tab le 2 –5 shows the recommended setup.

With the MFP vector register set to 0x48, the MFP’s base vector is 0x40 and the eight

SCCs interrupt at the vector numbers shown in Ta bl e 2 –6.

Refer to the MC68901 Multi-function Peripheral (Motorola) for MFP programming

instructions. The sample protocol software package includes code to perform MFP ini-

tialization and handle MFP control of SCC interrupts.

Table 2–5: Setup for MFP Initialization

Va lu e

(Hexadecimal)

VR 48

DDR 00

AER 00

IPRA 00

IPRB 00

IERA C0

IERB CF

IMRA C0

IMRB CF