HD64F2638F20J Datasheet, PDF (130/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 3 MCU Operating Modes
H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
Note that the functions of each pin depend on the operating mode.
The chip can be used only in modes 4 to 7. This means that the mode pins must be set to select one
of these modes. Do not change the inputs at the mode pins during operation.
3.1.2 Register Configuration
The chip has a mode control register (MDCR) that indicates the inputs at the mode pins (MD2 to
MD0), and a system control register (SYSCR) that controls the operation of the chip. Table 3-2
summarizes these registers.
Table 3-2 MCU Registers
Name
Abbreviation R/W
Mode control register
MDCR
R
System control register
SYSCR
R/W
Pin function control register PFCR
R/W
Note: * Lower 16 bits of the address.
Initial Value
Undetermined
H'01
H'0D/H'00
Address^*
H'FDE7
H'FDE5
H'FDEB
3.2 Register Descriptions
3.2.1 Mode Control Register (MDCR)
Bit
:
7
6
5
4
⎯
⎯
⎯
⎯
Initial value :
1
0
0
0
R/W
: R/W
⎯
⎯
⎯
3
2
1
0
⎯ MDS2 MDS1 MDS0
0
⎯*
⎯*
⎯*
⎯
R
R
R
Note: * Determined by pins MD2 to MD0.
MDCR is an 8-bit register that indicates the current operating mode of the chip.
Page 80 of 1458
REJ09B0103-0800 Rev. 8.00
May 28, 2010