Product data

129
(3) Specification differences in internal I/O registers
Mask ROM version of H8S/2128S, H8S/2127S are different from the H8S/2128 Series and
H8S/2124 Series in the specification of control registers for peripheral functions.
A/D converter: A/D Control Register (ADCR)
H8S/2128 Series,
H8S/2124 Series
Bit
Initial value
Read/Write
7
TRGS1
0
R/W
6
TRGS0
0
R/W
5
—
1
—
4
—
1
—
3
—
1
—
0
—
1
—
2
—
1
—
1
—
1
—
Bits 5 to 0—Reserved bits: These bits cannot be modified and are
always read as 1.
H8S/2128S Series
Mask ROM Version
(internal step-down
products)
Bits 5 to 0—Reserved bits: Should always be written 1.
Power-down state: Standby Control Register (SBYCR)
H8S/2128 Series,
H8S/2124 Series
Bit 6
STS2
0
1
Bit 5
STS1
0
1
0
1
Bit 4
STS0
0
1
0
1
0
1
0
1
Description
Standby time = 8,192 states (Initial value)
Standby time = 16,384 states
Standby time = 32,768 states
Standby time = 65,536 states
Standby time = 131,072 states
Standby time = 262,144 states
Reserved
Standby time = 16 states*
Note: * This setting must not be used in the flash memory versions.
H8S/2128S Series
Mask ROM Version
(internal step-down
products)
Bit 6
STS2
0
1
Bit 5
STS1
0
1
0
1
Bit 4
STS0
0
1
0
1
0
1
0
1
Description
Standby time = 8,192 states (Initial value)
Standby time = 16,384 states
Standby time = 32,768 states
Standby time = 65,536 states
Standby time = 131,072 states
Standby time = 262,144 states
Reserved
Standby time = 16 states*
Note: * This setting must not be used in the flash memory versions and
H8S/2128S Series.