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型號(hào)：	UPD703270GF-XXX-JBT
元件分類：	微控制器/微處理器
英文描述：	32-BIT, MROM, 20 MHz, RISC MICROCONTROLLER, PQFP100
封裝：	14 X 20 MM, PLASTIC, QFP-100
文件頁(yè)數(shù)：	843/1080頁(yè)
文件大?。?/td>	6965K
代理商：	UPD703270GF-XXX-JBT

CHAPTER 19 CAN CONTROLLER

User’s Manual U16541EJ4V0UD

19.9.2 Receive history list function

The receive history list (RHL) function records in the receive history list the number of the receive message buffer

in which each data frame or remote frame was received and stored. The RHL consists of storage elements equivalent

to up to 23 messages, the last in-message pointer (LIPT) with the corresponding C0LIPT register and the receive

history list get pointer (RGPT) with the corresponding C0RGPT register.

The RHL is undefined immediately after the transition of the CAN module from the initialization mode to one of the

operation modes.

The C0LIPT register holds the contents of the RHL element indicated by the value of the LIPT pointer minus 1. By

reading the C0LIPT register, therefore, the number of the message buffer that received and stored a data frame or

remote frame first can be checked. The LIPT pointer is utilized as a write pointer that indicates to what part of the

RHL a message buffer number is recorded. Any time a data frame or remote frame is received and stored, the

corresponding message buffer number is recorded to the RHL element indicated by the LIPT pointer. Each time

recording to the RHL has been completed, the LIPT pointer is automatically incremented. In this way, the number of

the message buffer that has received and stored a frame will be recorded chronologically.

The RGPT pointer is utilized as a read pointer that reads a recorded message buffer number from the RHL. This

pointer indicates the first RHL element that the CPU has not read yet. By reading the C0RGPT register by software,

the number of a message buffer that has received and stored a data frame or remote frame can be read. Each time a

message buffer number is read from the C0RGPT register, the RGPT pointer is automatically incremented.

If the value of the RGPT pointer matches the value of the LIPT pointer, the C0RGPT.RHPM bit (receive history list

pointer match) is set to 1. This indicates that no message buffer number that has not been read remains in the RHL.

If a new message buffer number is recorded, the LIPT pointer is incremented and because its value no longer

matches the value of the RGPT pointer, the RHPM bit is cleared. In other words, the numbers of the unread message

buffers exist in the RHL.

If the LIPT pointer is incremented and matches the value of the RGPT pointer minus 1, the C0RGPT.ROVF bit

(receive history list overflow) is set to 1. This indicates that the RHL is full of numbers of message buffers that have

not been read. When further message reception and storing occur, the last recorded message buffer number is

overwritten by the number of the message buffer that received and stored the new message. After the ROVF bit has

been set to 1, the recorded message buffer numbers in the RHL do not completely reflect chronological order.

However the messages themselves are not lost and can be located by a CPU search in the message buffer memory

with the help of the DN bit.

As long as the RHL contains 23 or less entries the sequence of occurrence is maintained. If more receptions occur

without the RHL being read by the host processor, a complete sequence of receptions can not be recovered.

m = 00 to 31

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