HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 521

• Manufacturer Part Number: HD6432160
• Description: Hitachi 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

17.5
17.5.1
When KBIOE is 0, the internal KCLK and internal KD settings are fixed at 1. Therefore, if the
KCLK pin is low when the KBIOE bit is set to 1, the edge detection circuit operates and the
KCLK falling edge is detected.
If the KBFSEL bit and KBE bit are both 0 at this time, the KBF bit is set. Figure 17.14 shows the
timing of KBIOE setting and KCLK falling edge detection.
17.5.2
Keyboard buffer controller operation can be enabled or disabled using the module stop control
register. The initial setting is for keyboard buffer controller operation to be halted. Register access
is enabled by canceling module stop mode. For details, refer to section 26, Power-Down Modes.
ø
KCLK (pin)
Internal KCLK
(KCLKI)
KBIOE
Falling edge
signal
KBFSEL
KBE
KBF
Usage Notes
KBIOE Setting and KCLK Falling Edge Detection
Module Stop Mode Setting
Figure 17.14 KBIOE Setting and KCLK Falling Edge Detection Timing
T1
T2
Rev. 2.0, 08/02, page 481 of 788