upd78f0134hgka1-9et-a Renesas Electronics Corporation., upd78f0134hgka1-9et-a Datasheet - Page 538

• Manufacturer Part Number: upd78f0134hgka1-9et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

538
This appendix lists cautions described in this document.
“Classification (hard/soft)” in table is as follows.
Hard:
Soft:
Pin
connection
Pin
functions
Memory
space
Port
functions
Function
Cautions for microcontroller internal/external hardware
Cautions for software such as register settings or programs
P31
IMS: Internal
memory size
switching
register
SFR area:
Special function
register
SP: Stack
pointer
P02, P03, P04
P10, P11, P12
P31
Details of
Function
Connect the AV
In the PD78F0138HD, be sure to pull the P31 pin down after reset to prevent
malfunction.
Regardless of the internal memory capacity, the initial values of the internal
memory size switching register (IMS) and internal expansion RAM size
switching register (IXS) of all products in the 78K0/KE1+ are fixed (IMS = CFH,
IXS = 0CH). Therefore, set the value corresponding to each product as
indicated below. In addition, set the following values to the IMS and the IXS
when using the 78K0/KE1+ to evaluate the program of a mask ROM version of
the 78K0/KE1.
Do not access addresses to which SFRs are not assigned.
Since RESET input makes the SP contents undefined, be sure to initialize the
SP before using the stack.
When P02/SO11, P03/SI11, and P04/SCK11 are used as general-purpose
ports, set serial operation mode register 11 (CSIM11) and serial clock selection
register 11 (CSIC11) to the default status (00H).
When P10/SCK10/TxD0, P11/SI10/RxD0, and P12/SO10 are used as general-
purpose ports, set serial operation mode register 10 (CSIM10) and serial clock
selection register 10 (CSIC10) to the default status (00H).
In the PD78F0138HD, be sure to pull the P31 pin down after reset to prevent
malfunction.
In the case of a 1-bit memory manipulation instruction, although a single bit is
manipulated, the port is accessed as an 8-bit unit. Therefore, on a port with a
mixture of input and output pins, the output latch contents for pins specified as
input are undefined, even for bits other than the manipulated bit.
APPENDIX D LIST OF CAUTIONS
User’s Manual U16899EJ3V0UD
SS
pin to V
SS
.
Cautions
p. 21
p. 39
p. 46
p. 55
p. 62
p. 86
p. 90
p. 96
p. 109
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