UPD78F0034BGC-8BS-A Renesas Electronics America, UPD78F0034BGC-8BS-A Datasheet - Page 325

• Manufacturer Part Number: UPD78F0034BGC-8BS-A
• Description: MCU 8-Bit 78K0 CISC 32KB Flash 2.5V/3.3V/5V 64-Pin LQFP
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0034BGC-8BS-A

• Package: 64LQFP
• Family Name: 78K0
• Maximum Speed: 12 MHz
• Ram Size: 1 KB
• Program Memory Size: 32 KB
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 51
• Interface Type: 3-Wire/UART
• On-chip Adc: 8-chx10-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 3

(2) Data format
(d) Port mode register 2 (PM2)
Address: FF22H After reset: FFH
Figure 16-12 compares the data format used in UART mode with that used in infrared data transfer mode.
The IR (infrared) frame corresponds to the bit string of the UART frame, which consists of pulses that include
a start bit, eight data bits, and a stop bit.
The length of the electrical pulses that are used to transmit and receive in an IR frame is 3/16 the length of the
cycle time for one bit (i.e., the “bit time”). This pulse (whose width is 3/16 the length of one bit time) rises from
the middle of the bit time (see the figure below).
Symbol
PM2
Port mode register 2 is used to set input/output of port 2 in 1-bit units.
To use the P24/TxD0 pin as a serial data output, clear PM24 and the output latch of P24 to 0.
To use the P23/RxD0 pin as a serial data input, and the P25/ASCK0 pin as a clock input, set PM23 and PM25
to 1. At this time, the output latches of P23 and P25 can be either 0 or 1.
PM2 is set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets PM2 to FFH.
PM2n
7
1
0
1
Output mode (output buffer on)
Input mode (output buffer off)
6
1
CHAPTER 16 SERIAL INTERFACE UART0
R/W
PM25
5
User’s Manual U14046EJ5V0UD
Pulse width = 3/16 bit time
I/O mode selection of P2n pin (n = 0 to 5)
Bit time
PM24
4
PM23
3
PM22
2
PM21
1
PM20
0
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