NEC V850E/PH2, User Manual

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Chapter 18 AFCAN Controller
User’s Manual U16580EE3V1UD00
predetermined timing. At this time, the CAN sleep mode request is not held pending and is ignored.
• Even when initialization mode and sleep mode are not requested simultaneously (i.e the first
request has not been granted while the second request is made), the request for initialization has
priority over the sleep mode request. The sleep mode request is cancelled when the initialization
mode is requested. When a pending request for initialization mode is present, a subsequent request
for Sleep mode request is cancelled right at the point in time where it was submitted.
(2) Status in CAN sleep mode
The CAN module is in the following state after it enters the CAN sleep mode:
• The internal operating clock is stopped and the power consumption is minimized.
• The function to detect the falling edge of the CAN reception pin (CRXDn) remains in effect to wake
up the CAN module from the CAN bus.
• To wake up the CAN module from the CPU, data can be written to the PSMODE[1:0] bits of the
CAN module control register (CnCTRL), but nothing can be written to other CAN module registers
or bits.
• The CAN module registers can be read, except for the CnLIPT, CnRGPT, CnLOPT, and CnTGPT
registers.
• The CAN message buffer registers cannot be written or read.
• MBON bit of the CAN Global Control register (CnGMCTRL) is cleared.
• A request for transition to the initialization mode is not acknowledged and is ignored.