UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 476

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

16.11.3 Example of using power saving modes
consumption. By using the power saving mode specific to the CAN module and the power saving mode specific to the
CPU in combination, the CPU can be woken up from the power saving status by the CAN bus.
mode. If an edge transition from recessive to dominant is detected at the CAN reception pin (CRxD) in this status, the
CINTS5 bit in the CAN module is set to 1. If the CIE5 bit of the C0CTRL register is set to 1, a wakeup interrupt
(INTC0WUP) is generated. The CAN module is automatically released from the CAN sleep mode (PSMODE = 00B)
and returns to the normal operation mode. The CPU, in response to INTC0WUP, can release its own power saving
mode and return to the normal operation mode.
be stopped. In this case, the operating clock supplied to the CAN module is stopped after the CAN module is put in
the CAN sleep mode. Then the CPU enters a power saving mode in which the clock supplied to the CPU is stopped.
If an edge transition from recessive to dominant is detected at the CAN reception pin (CRxD) in this status, the CAN
module can set the CINTS5 bit to 1 and generate the wakeup interrupt (INTC0WUP) even if it is not supplied with the
clock. The other functions, however, do not operate because clock supply to the CAN module is stopped, and the
module remains in the CAN sleep mode. The CPU, in response to INTC0WUP, releases its power saving mode,
resumes supply of the internal clocks, including the clock to the CAN module, after the oscillation stabilization time
has elapsed, and starts instruction execution. The CAN module is immediately released from the CAN sleep mode
when clock supply is resumed, and returns to the normal operation mode (PSMODE = 00B).
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In some application systems, it may be necessary to place the CPU in a power saving mode to reduce the power
Here is an example of using the power saving modes.
First, put the CAN module in the CAN sleep mode (PSMODE = 01B). Next, put the CPU in the power saving
To further reduce the power consumption of the CPU, the internal clocks, including that of the CAN module, may
CHAPTER 16 CAN CONTROLLER
User’s Manual U17554EJ4V0UD