Datasheet

23.0.6.10 Module Routing Register

This register supports the re-routing of the CAN0, CAN4, SPI0, SPI1, and SPI2 pins to alternative

ports. This allows a software re-configuration of the pinouts of the different package options with

respect to above peripherals.

NOTE

The purpose of the module routing register is to provide maximum

ﬂexibility for derivatives with a lower number of MSCAN and SPI

modules.

23.0.7 Ports

23.0.7.1 BKGD Pin

The BKGD pin is associated with the S12X_BDM and S12X_EBI modules. During reset, the

BKGD pin is used as MODC input.

23.0.7.2 Port A and B

Port A pins PA[7:0] and Port B pins PB[7:0] can be used for either general-purpose I/O, or, in 144-

pin packages, also with the external bus interface. In this case port A and port B are associated with

the external address bus outputs ADDR15–ADDR8 and ADDR7–ADDR0, respectively. PB0 is the

ADDR0 or

UDS output.

23.0.7.3 Port C and D

Port C pins PC[7:0] and port D pins PD[7:0] can be used for either general-purpose I/O, or, in 144-

pin packages, also with the external bus interface. In this case port C and port D are associated with

the external data bus inputs/outputs DATA15–DATA8 and DATA7–DATA0, respectively.

These pins are configured for reduced input threshold in certain operating modes (refer to

S12X_EBI section).

NOTE

Port C and D are neither available in 112-pin nor in 80-pin packages.

Table 23-68. Module Implementations on Derivatives

Number

of Modules

MSCAN Modules SPI Modules

CAN0 CAN1 CAN2 CAN3 CAN4 SPI0 SPI1 SPI2

5 yes yes yes yes yes — — —

4 yes yes yes — yes — — —

3 yes yes — — yes yes yes yes

2 yes — — — yes yes yes —

1 yes————yes——