UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 132

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

4.2.6 Port 7
the input mode or output mode in 1-bit units using port mode register 7 (PM7). When the P70 to P77 (P70 to P73 in
78K0/DE2, P70 to P77 in 78K0/DF2) pins are used as an input port, use of an on-chip pull-up resistor can be specified
in 1-bit units by pull-up resistor option register 7 (PU7).
I/O, serial interface data I/O and clock I/O, timer I/O, and segment output pins for the LCD controller/driver.
130
Port 7 is a 4-bit I/O port in 78K0/DE2 and an 8-bit I/O port in 78K0/DF2 with an output latch. Port 7 can be set to
This port can also be used for output pins for the sound generator, clock output pins, buzzer output pins, CAN I/F
Reset signal generation sets port 7 to input mode.
Figures 4-15 to 4-21 show block diagrams of port 7.
Cautions 1. To use P74/SCK11 and P76/SO11 as general-purpose ports, set serial operation mode
Note
Remark The function within arrowheads (<>) can be assigned by setting the input switch control register (ISC).
WR
WR
WR
RD
P7:
PU7:
PM7:
RD:
WR
PORT
PU
PM
PD78F0844, 78F0845, 78F0846, 78F0847, 78F0848, and 78F0849 only.
2. To use P77/SSI11/SEG27 as general-purpose ports, set serial operation mode register 11
: Write signal
register 10 (CSIM10) and serial clock selection resister 10 (CSIC10) to the default status (00H).
(CSIM11) to the default status (00H).
Port register 7
Pull-up resistor option register 7
Port mode register 7
Read signal
Output latch
Alternate
function
PM70
PU70
(P70)
PM7
PU7
P7
Figure 4-12. Block Diagram of P70
Preliminary User’s Manual U19748EJ1V0UD
CHAPTER 4 PORT FUNCTIONS
EV
DD
P-ch
P70/CRxD
Note
/<RxD60/INTPR60>