TNR8CA040AE RENESAS | Alldatasheet
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(c) 2014. Renesas Electronics Corporation. All rights reserved. Page 1 of 5 Date: Mar. 27, 2014 RENESAS TECHNICAL UPDATE 1753, Shimonumabe, Nakahara-ku, Kawasaki-shi, Kanagawa 211-8668 Japan Renesas Electronics Corporation Product Category MPU/MCU Document No. TN-R8C-A040A/E Rev. 1.00 Title Changes in the Voltage Monitor 2 Interrupt Specifications Information Category Technical Notification Applicable Products See below Lot No. Reference Document Specifications for the voltage monitor 2 interrupt have been partially modified in the products below. 1. Applicable products: R8C/11 Group, R8C/13 Group, R8C/14 Group, R8C/15 Group, R8C/16 Group, R8C/17 Group R8C/18 Group, R8C/19 Group, R8C/1A Group, R8C/1B Group 2. Change: When in voltage monitor 2 interrupt mode (VW2C6 bit in the VW2C register is 0), regardless of the setting of the VW2C1 bit in the VW2C register (voltage monitor 2 digital filter disabled mode select bit), an interrupt request is generated when Vdet2 > VCC and when VCC > Vdet2.
RENESAS TECHNICAL UPDATE TN -R8C-A040A/E Date: Mar. 27, 2014 Page 2 of 5 3. Examples of changes to the hardware manual (R8C/1A Group, R8C/1B Group (REJ09B0252-0130)). Interrupt request at Vdet2 > VCC and VCC > Vdet2
RENESAS TECHNICAL UPDATE TN -R8C-A040A/E Date: Mar. 27, 2014 Page 3 of 5 The VW2C7 bit is disabled when the VW2C6 bit is 0 (voltage monitor 2 interrupt mode).
RENESAS TECHNICAL UPDATE TN -R8C-A040A/E Date: Mar. 27, 2014 Page 4 of 5 Vdet2 VCA13 bit Internal reset signal (VW2C6 = 1) VCC The above applies under the following conditions.
- VCA27 bit in the VCA2 register = 1 (voltage detection 2 circuit enabled)
- VW2C0 bit in the VW2C register = 1 (voltage monitor 2 interrupt and voltage monitor 2 reset enabled) Note: 1. If voltage monitor 1 reset is not used, set the power supply to VCC ≥ 2.7.
2.7 V (1)
to 0 (digital filter enabled). VW2C2 bit When the VW2C1 bit is set to 1 (digital filter disabled) and the VW2C7 bit is set to 0 (Vdet2 or above). VCA13: Bit in the VCA1 register VW2C1, VW2C2, VW2C6, VW2C7: Bits in the VW2C register Set to 0 by interrupt request acknowledgement Set to 0 by a program Voltage monitor 2 interrupt request (VW2C6 = 0) Voltage monitor 2 interrupt request (VW2C6 = 0) VW2C2 bit When the VW2C1 bit is set to 1 (digital filter disabled) and the VW2C7 bit is set to 1 (Vdet2 or below). Voltage monitor 2 interrupt request (VW2C6 = 0) Internal reset signal (VW2C6 = 1) Sampling clock of digital filter × 4 cycles Set to 0 by a program Set to 0 by interrupt request acknowledgement Sampling clock of digital filter × 4 cycles Set to 0 by a program Set to 0 by interrupt request acknowledgement Figure 7.9 Operating Example of Voltage Monitor 2 Interrupt and Voltage Monitor 2 Reset
RENESAS TECHNICAL UPDATE TN -R8C-A040A/E Date: Mar. 27, 2014 Page 5 of 5