UPD70F3786GJ-GAE-AX Renesas Electronics America, UPD70F3786GJ-GAE-AX Datasheet - Page 1121

• Manufacturer Part Number: UPD70F3786GJ-GAE-AX
• Description: MCU 32BIT V850ES/JX3-E 144-LQFP
• Manufacturer: Renesas Electronics America
• Series: V850ES/Jx3-Er

Specifications of UPD70F3786GJ-GAE-AX

• Core Processor: RISC
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: CAN, CSI, EBI/EMI, Ethernet, I²C, UART/USART, USB
• Peripherals: DMA, LVD, PWM, WDT
• Number Of I /o: 100
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 124K x 8
• Voltage - Supply (vcc/vdd): 2.85 V ~ 3.6 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

21.9.3 Receive history list function
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.
operation modes.
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.
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.
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.
(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.
The receive history list (RHL) function records in the receive history list the number of the receive message buffer
The RHL is undefined immediately after the transition of the CAN module from the initialization mode to one of the
The C0LIPT register holds the contents of the RHL element indicated by the value of the LIPT pointer minus 1. By
The RGPT pointer is utilized as a read pointer that reads a recorded message buffer number from the RHL. This
If the value of the RGPT pointer matches the value of the LIPT pointer, the C0RGPT.RHPM bit (receive history list
If the LIPT pointer is incremented and matches the value of the RGPT pointer minus 1, the C0RGPT.ROVF bit
Caution Even if the receive history list overflows (C0RGPT.ROVF bit = 1), the receive history can be read
until no more history is left unread and the C0RGPT.RHPM bit is set (1). However, the ROVF bit
is kept set (1) (= overflow occurs) until cleared (0) by software. In this status, the RHPM bit is not
cleared (0), unless the ROVF bit is cleared (0), even if a new receive history is stored and written
to the list. If ROVF bit = 1 and RHPM bit = 1 and the receive history list overflows, therefore, the
RHPM bit indicates that no more history is left unread even if new history is received and stored.
CHAPTER 21 CAN CONTROLLER
User’s Manual U19601EJ2V0UD
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