h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 494

• Manufacturer Part Number: h8s-2111b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

19.5
The subclock input circuit controls subclock input from the EXCL pin. To use the subclock, a
32.768-kHz external clock should be input from the EXCL pin. At this time, the P96DDR bit in
P9DDR should be cleared to 0, and the EXCLE bit in LPWRCR should be set to 1.
Subclock input conditions are shown in table 19.5. When the subclock is not used, subclock input
should not be enabled.
Table 19.5 Subclock Input Conditions
19.6
To remove noise from the subclock input at the EXCL pin, the subclock is sampled by a divided φ
clock. The sampling frequency is set by the NESEL bit in LPWRCR.
The subclock is not sampled in subactive mode, subsleep mode, or watch mode.
Rev. 1.00, 05/04, page 460 of 544
Item
Subclock input pulse width
low level
Subclock input pulse width
high level
Subclock input rising time
Subclock input falling time
Subclock Input Circuit
Waveform Forming Circuit
EXCL
t
EXCLr
Symbol
t
t
t
t
Figure 19.7 Subclock Input Timing
EXCLL
EXCLH
EXCLr
EXCLf
t
EXCLH
Min
—
—
—
—
Vcc = 3.0 to 3.6 V
Typ
15.26
15.26
—
—
t
EXCLf
t
EXCLL
Max
—
—
10
10
Unit
µs
µs
ns
ns
V
CC
× 0.5
Measurement
Condition
Figure 19.7