upd78f0103 Renesas Electronics Corporation., upd78f0103 Datasheet - Page 217

• Manufacturer Part Number: upd78f0103
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(4) Port mode register 1 (PM1)
Cautions 1. When the Ring-OSC clock is selected as the clock to be supplied to the CPU, the clock of the
Remarks 1. f
This register sets port 1 input/output in 1-bit units.
When using the P10/TxD0/SCK10 pin for serial interface data output, clear PM10 to 0 and set the output latch of
P10 to 1.
When using the P11/RxD0/SI10 pin for serial interface data input, set PM11 to 1. The output latch of P11 at this
time may be 0 or 1.
PM1 can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets this register to FFH.
Address: FF21H
Symbol
PM1
2. Make sure that bit 6 (TXE0) and bit 5 (RXE0) of the ASIM0 register = 0 when rewriting the
3. The baud rate value is the output clock of the 5-bit counter divided by 2.
2. f
3. k:
4. ×:
5. Figures in parentheses apply to operation at f
6. TMC506: Bit 6 of 8-bit timer mode control register 50 (TMC50)
7. TMC501: Bit 1 of TMC50
Ring-OSC oscillator is divided and supplied as the count clock. If the base clock is the Ring-
OSC clock, the operation of serial interface UART0 is not guaranteed.
MDL04 to MDL00 bits.
PM1n
PM17
XCLK0
X
CHAPTER 11 SERIAL INTERFACE UART0 (
:
7
0
1
: Frequency of base clock selected by the TPS01 and TPS00 bits
After reset: FFH
Value set by the MDL04 to MDL00 bits (k = 8, 9, 10, ..., 31)
X1 input clock oscillation frequency
Don’t care
Output mode (output buffer on)
Input mode (output buffer off)
PM16
6
Figure 11-5. Format of Port Mode Register 1 (PM1)
PM15
5
R/W
P1n pin I/O mode selection (n = 0 to 7)
User’s Manual U15836EJ5V0UD
PM14
4
PM13
3
µ
X
PD780102, 780103, 78F0103 ONLY)
= 10 MHz
PM12
2
PM11
1
PM10
0
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