Register Descriptions; Next Data Enable Registers H And L (Nderh, Nderl) - Hitachi H8S/2646 Hardware Manual

11.2

Register Descriptions

11.2.1

Next Data Enable Registers H and L (NDERH, NDERL)

NDERH
Bit : 7
NDER15 NDER14 NDER13 NDER12 NDER11 NDER10 NDER9
Initial value : 0
R/W : R/W
NDERL
Bit : 7
NDER7
Initial value : 0
R/W : R/W
NDERH and NDERL are 8-bit readable/writable registers that enable or disable pulse output on a
bit-by-bit basis.
If a bit is enabled for pulse output by NDERH or NDERL, the NDR value is automatically
transferred to the corresponding PODR bit when the TPU compare match event specified by PCR
occurs, updating the output value. If pulse output is disabled, the bit value is not transferred from
NDR to PODR and the output value does not change.
NDERH and NDERL are each initialized to H'00 by a reset and in hardware standby mode. They
are not initialized in software standby mode.
NDERH Bits 7 to 0—Next Data Enable 15 to 8 (NDER15 to NDER8): These bits enable or
disable pulse output on a bit-by-bit basis.
Bits 7 to 0
NDER15 to NDER8
0
1
6 5
0 0
R/W R/W
6 5
NDER6 NDER5
0 0
R/W R/W
Description
Pulse outputs PO15 to PO8 are disabled (NDR15 to NDR8 are not
transferred to POD15 to POD8)
Pulse outputs PO15 to PO8 are enabled (NDR15 to NDR8 are transferred
to POD15 to POD8)
4 3
0 0
R/W R/W
4 3
NDER4 NDER3 NDER2
0 0
R/W R/W
2 1
NDER8
0 0
R/W R/W R/W
2 1
NDER1 NDER0
0 0
R/W R/W R/W
(Initial value)
0
0
0
0
391