M16C62P_06 Datasheet, PDF (71/421 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

M16C/62P Group (M16C/62P, M16C/62PT)
7. Processor Mode
Processor Mode Register 0 ⁽¹⁾
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
PM0
Address
0004h
After Reset
00000000b (CNVSS pin = L)
00000011b (CNVSS pin = H)
Bit Symbol
Bit Name
Function
RW
Processor Mode Bit ⁽⁴⁾
PM00
PM01
PM02
PM03
R/W Mode Select Bit ⁽²⁾
Softw are Reset Bit
b1 b0
0 0 : Single-chip mode
RW
0 1 : Memory expansion mode
1 0 : Do not set
RW
1 1 : Microprocessor mode
___ _____ ____
0 : RD, BHE, WR
___ ______ _____
RW
1 : RD, WRH, WRL
Setting this bit to “1” resets the microcomputer.
When read, its content is “0”.
RW
Multiplexed Bus Space Select _{b5 b4}
PM04
Bit ⁽²⁾
0 0 : Multiplexed bus is unused
___
RW
(Separate bus in the entire CS space)
_____
0 1 : Allocated to CS2 space
_____
1 0 : Allocated to CS1 space
___
PM05
1 1 : Allocated to the entire CS space ⁽³⁾
RW
Port P4_0 to P4_3 Function 0 : Address output
PM06 _{Select Bit (2)}
1 : Port function (Address is not output)
RW
PM07
BCLK Output Disable Bit ⁽²⁾
0 : BCLK is output
1 : BCLK is not output (Pin is left high-impedance) ^RW
NOTES :
1. Write to this register after setting the PRC1 bit in the PRCR register to “1” (w rite enable).
2. Effective w hen the PM01 to PM00 bits are set to “01b” (memory expansion mode) or “11b” (microprocessor mode).
3. To set the PM01 to PM00 bits are “01b” and the PM05 to PM04 bits are “11b” (multiplexed bus assigned to the entire
___
CS space), apply an “H” signal to the BYTE pin (external data bus is 8 bits w ide). While the CNVSS pin is held “H”
(= VCC1), do not rew rite the PM05 to PM04 bits to “11b” after reset.
If the PM05 to PM04 bits are set to “11b” during memory expansion mode, P3_1 to P3_7 and P4_0 to P4_3 become
___
I/O ports, in w hich case the accessible area for each CS is 256 bytes.
4. The PM01 to PM00 bits do not change at softw are reset, w atchdog timer reset and oscillation stop detection reset.
Figure 7.1 PM0 Register
Rev.2.41 Jan 10, 2006 Page 56 of 390
REJ09B0185-0241