UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 93

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

5.2.1 Port 0
using port mode register 0 (PM0). When the P00, P01, P05 and P06 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 0 (PU0).
Port 0 is a 4-bit I/O port with an output latch. Port 0 can be set to the input mode or output mode in 1-bit units
This port can also be used for timer I/O, serial interface chip select input.
Reset signal generation sets port 0 to input mode.
Figures 5-2 and 5-3 show block diagrams of port 0.
Caution To use P05/SSI11/TI001 as general-purpose ports, set serial operation mode register 11
WR
P0:
PU0:
PM0:
RD:
WR××: Write signal
WR
WR
RD
PORT
PM
PU
(CSIM11) to the default status (00H).
Read signal
Port register 0
Pull-up resistor option register 0
Port mode register 0
Alternate function
PM00, PM05
PU00, PU05
Output latch
(P00, P05)
PU0
PM0
P0
Figure 5-2. Block Diagram of P00 and P05
CHAPTER 5 PORT FUNCTIONS
User’s Manual U17554EJ4V0UD
EV
DD
P-ch
P00/TI000,
P05/SSI11/TI001
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