h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 743

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Bit 5—Noise Elimination Sampling Frequency Select (NESEL): Selects the frequency at which
the subclock ( SUB) input from the EXCL pin is sampled with the clock ( ) generated by the
system clock oscillator. When = 5 MHz or higher, clear this bit to 0.
Bit 4—Subclock Input Enable (EXCLE): Controls subclock input from the EXCL pin.
Bits 3 to 0—Reserved: These bits cannot be modified and are always read as 0.
24.2.3
TCSR1
TCSR1 is an 8-bit readable/writable register that performs selection of the WDT1 TCNT input
clock, mode, etc.
Only bit 4 is described here. For details of the other bits, see section 14.2.2, Timer Control/Status
Register (TCSR).
TCSR is initialized to H'00 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bit 5
NESEL
0
1
Bit 4
EXCLE
0
1
Bit
Initial value
Read/Write
Note: * Only 0 can be written in bit 7, to clear the flag.
Timer Control/Status Register (TCSR)
Description
Sampling at
Sampling at
Description
Subclock input from EXCL pin is disabled
Subclock input from EXCL pin is enabled
R/(W) *
OVF
7
0
divided by 32
divided by 4
WT/IT
R/W
6
0
TME
R/W
5
0
PSS
R/W
4
0
RST/NMI
Rev. 4.00 Jun 06, 2006 page 689 of 1004
R/W
3
0
Section 24 Power-Down State
CKS2
R/W
2
0
CKS1
R/W
REJ09B0301-0400
1
0
(Initial value)
(Initial value)
CKS0
R/W
0
0