S912XET256J2VAGR Freescale Semiconductor, S912XET256J2VAGR Datasheet - Page 613

• Manufacturer Part Number: S912XET256J2VAGR
• Description: 16-bit Microcontrollers - MCU Watchdog OSC/Timer -40 C to + 105 C HCS12X MCU SPI
• Manufacturer: Freescale Semiconductor

Specifications of S912XET256J2VAGR

• Core: HCS12X
• Data Bus Width: 16 bit
• Maximum Clock Frequency: 50 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 16 KB
• On-chip Adc: Yes
• Package / Case: LQFP
• Mounting Style: SMD/SMT
• A/d Bit Size: 12 bit
• A/d Channels Available: 24
• Interface Type: CAN, SCI, SPI
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 119
• Number Of Timers: 25
• Program Memory Type: Flash
• Supply Voltage - Max: 1.98 V, 2.9 V, 5.5 V
• Supply Voltage - Min: 1.72 V, 2.7 V, 3.13 V

1. See the Bosch CAN 2.0A/B specification for a detailed definition of transmitter and receiver states.
2. In order to protect from accidentally violating the CAN protocol, TXCAN is immediately forced to a recessive state when the
3. The CPU has to make sure that the WUPE register and the WUPIE wake-up interrupt enable register (see
4. The CPU cannot clear SLPRQ before the MSCAN has entered sleep mode (SLPRQ = 1 and SLPAK = 1).
5. The CPU cannot clear INITRQ before the MSCAN has entered initialization mode (INITRQ = 1 and INITAK = 1).
6. In order to protect from accidentally violating the CAN protocol, TXCAN is immediately forced to a recessive state when the
7. Not including WUPE, INITRQ, and SLPRQ.
8. TSTAT1 and TSTAT0 are not affected by initialization mode.
9. RSTAT1 and RSTAT0 are not affected by initialization mode.
16.3.2.2
The CANCTL1 register provides various control bits and handshake status information of the MSCAN
module as described below.
Freescale Semiconductor
INITRQ
SLPRQ
CPU enters wait (CSWAI = 1) or stop mode (see
in Stop
“MSCAN Receiver Interrupt Enable Register
initialization mode is requested by the CPU. Thus, the recommended procedure is to bring the MSCAN into sleep mode
(SLPRQ = 1 and SLPAK = 1) before requesting initialization mode.
Field
1
0
(5),(6)
(4)
Mode”)
Sleep Mode Request — This bit requests the MSCAN to enter sleep mode, which is an internal power saving
mode (see
idle, i.e., the module is not receiving a message and all transmit buffers are empty. The module indicates entry
to sleep mode by setting SLPAK = 1 (see
cannot be set while the WUPIF flag is set (see
Sleep mode will be active until SLPRQ is cleared by the CPU or, depending on the setting of WUPE, the MSCAN
detects activity on the CAN bus and clears SLPRQ itself.
0 Running — The MSCAN functions normally
1 Sleep mode request — The MSCAN enters sleep mode when CAN bus idle
Initialization Mode Request — When this bit is set by the CPU, the MSCAN skips to initialization mode (see
Section 16.4.4.5, “MSCAN Initialization
synchronization to the CAN bus is lost. The module indicates entry to initialization mode by setting INITAK = 1
(Section 16.3.2.2, “MSCAN Control Register 1
The following registers enter their hard reset state and restore their default values: CANCTL0
CANRIER
The registers CANCTL1, CANBTR0, CANBTR1, CANIDAC, CANIDAR0-7, and CANIDMR0-7 can only be
written by the CPU when the MSCAN is in initialization mode (INITRQ = 1 and INITAK = 1). The values of the
error counters are not affected by initialization mode.
When this bit is cleared by the CPU, the MSCAN restarts and then tries to synchronize to the CAN bus. If the
MSCAN is not in bus-off state, it synchronizes after 11 consecutive recessive bits on the CAN bus; if the MSCAN
is in bus-off state, it continues to wait for 128 occurrences of 11 consecutive recessive bits.
Writing to other bits in CANCTL0, CANRFLG, CANRIER, CANTFLG, or CANTIER must be done only after
initialization mode is exited, which is INITRQ = 0 and INITAK = 0.
0 Normal operation
1 MSCAN in initialization mode
MSCAN Control Register 1 (CANCTL1)
.
(9)
Section 16.4.5.5, “MSCAN Sleep
Table 16-3. CANCTL0 Register Field Descriptions (continued)
, CANTFLG, CANTIER, CANTARQ, CANTAAK, and CANTBSEL.
MC9S12XE-Family Reference Manual Rev. 1.25
(CANRIER)) is enabled, if the recovery mechanism from stop or wait is required.
Section 16.4.5.2, “Operation in Wait
Mode”). Any ongoing transmission or reception is aborted and
Section 16.3.2.2, “MSCAN Control Register 1
Chapter 16 Freescale’s Scalable Controller Area Network (S12MSCANV3)
Mode”). The sleep mode request is serviced when the CAN bus is
Section 16.3.2.5, “MSCAN Receiver Flag Register
(CANCTL1)”).
Description
Mode” and
Section 16.4.5.3, “Operation
(CANCTL1)”). SLPRQ
(7)
Section 16.3.2.6,
, CANRFLG
(CANRFLG)”).
(8)
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