M16C1N Datasheet, PDF (228/238 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/10 SERIES

M16C/1N Group
20. Precautionary Notes in Using the Device
20.6.2 CAN Transceiver in Boot Mode
When programming the flash memory in boot mode via CAN bus, the operation mode of CAN
transceiver should be set to "high-speed mode" or "normal operation mode". If the operation mode
is controlled by the microcomputer, CAN transceiver must be set the operation mode to "high-
speed mode" or "normal operation mode" before programming the flash memory by changing the
switch etc. Figure 20.5 shows pin connections of CAN transceiver.
In case of PCA82C250 (Philips product)
Standby mode
Rs pin (Note 1)
CAN communication
"H"
impossible
connection
M16C/1N
CTX P02
CRX P03
Port (Note 2)
PCA82C250
TXD CANH
RXD CANL
RS
high-speed mode
"L"
possible
M16C/1N
CTX P02
CRX P03
Port (Note 2)
PCA82C250
TXD CANH
RXD CANL
RS
Switch OFF
Switch ON
In case of PCA82C252 (Philips product)
sleep mode
STB pin (Note 1)
EN pin (Note 1)
CAN communication
"L"
"L"
impossible
connection
MCU
CTX P02
CRX P03
Port (Note 2)
Port (Note 2)
PCA82C252
TXD CANH
RXD CANL
STB
EN
normal operation mode
"H"
"H"
possible
MCU
CTX P02
CRX P03
Port (Note 2)
Port (Note 2)
PCA82C252
TXD CANH
RXD CANL
STB
EN
Switch OFF
Switch ON
Note 1: The pin which controls the operation mode of CAN transceiver.
Note 2: Connect to enabled port to control CAN transceiver.
Figure 20.5 CAN Transceiver Connection
Rev.1.00 Oct 20, 2004 page 216 of 222
REJ090007-0100Z