MC908GZ60CFUE Datasheet, PDF(144/352 Page) Freescale Semiconductor, Inc – Standard features, Features of the CPU08

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MC908GZ60CFUE Datasheet, PDF (144/352 Pages) Freescale Semiconductor, Inc – Standard features, Features of the CPU08

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MSCAN08 Controller (MSCAN08)

Table 12-1. MSCAN08 Interrupt Vector Addresses

Function

Wakeup

Error interrupts

Receive

Transmit

Source

WUPIF

RWRNIF

TWRNIF

RERRIF

TERRIF

BOFFIF

OVRIF

RXF

TXE0

TXE1

TXE2

Local

Mask

WUPIE

RWRNIE

TWRNIE

RERRIE

TERRIE

BOFFIE

OVRIE

RXFIE

TXEIE0

TXEIE1

TXEIE2

Global

Mask

I bit

12.7 Protocol Violation Protection

The MSCAN08 will protect the user from accidentally violating the CAN protocol through programming

errors. The protection logic implements the following features:

â¢ The receive and transmit error counters cannot be written or otherwise manipulated.

â¢ All registers which control the configuration of the MSCAN08 can not be modified while the

MSCAN08 is on-line. The SFTRES bit in the MSCAN08 module control register (see 12.13.1

MSCAN08 Module Control Register 0) serves as a lock to protect the following registers:

â MSCAN08 module control register 1 (CMCR1)

â MSCAN08 bus timing register 0 and 1 (CBTR0 and CBTR1)

â MSCAN08 identifier acceptance control register (CIDAC)

â MSCAN08 identifier acceptance registers (CIDAR0â3)

â MSCAN08 identifier mask registers (CIDMR0â3)

â¢ The CANTX pin is forced to recessive when the MSCAN08 is in any of the low-power modes.

12.8 Low-Power Modes

In addition to normal mode, the MSCAN08 has three modes with reduced power consumption: sleep, soft

reset, and power down. In sleep and soft reset mode, power consumption is reduced by stopping all

clocks except those to access the registers. In power-down mode, all clocks are stopped and no power

is consumed.

The WAIT and STOP instructions put the MCU in low-power consumption stand-by modes. Table 12-2

summarizes the combinations of MSCAN08 and CPU modes. A particular combination of modes is

entered for the given settings of the bits SLPAK and SFTRES. For all modes, an MSCAN08 wakeup

interrupt can occur only if SLPAK = WUPIE = 1.

MC68HC908GZ60 â¢ MC68HC908GZ48 â¢ MC68HC908GZ32 Data Sheet, Rev. 6

144

Freescale Semiconductor

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