h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 562

• Manufacturer Part Number: h8s-2161b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 17 Keyboard Buffer Controller
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.
Rev. 3.00 Mar 21, 2006 page 508 of 788
REJ09B0300-0300
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