UPD78F1502AGK-GAK-AX Datasheet, PDF (211/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 4 PORT FUNCTIONS
Figure 4-50. Format of Port Function Register (PFALL) (2/2)
PF5H
0
1
Port/segment outputs specification of the P54 to P57 pins
Used the P54 to P57 pins as port (other than segment output)
Used the P54 to P57 pins as segment output
PF5L
0
1
Port/segment outputs specification of P50 to P53 pins
Used the P50 to P53 pins as port (other than segment output)
Used the P50 to P53 pins as segment output
Caution For 78K0R/LF3, bits 3 and 7 must be set to 0. For 78K0R/LG3 and 78K0R/LH3, bit 7 must be set to 0.
(8) Input switch control register (ISC)
Bits 0 and 1 of ISC are used for linking with an external interrupt or a timer array unit when performing a LIN-bus
communication operation with UART3.
When bit 0 is set to 1, the input signal of the serial data input (RXD3) pin is selected as an external interrupt (INTP0)
that can be used to detect a wakeup signal.
When bit 1 is set to 1, the input signal of the serial data input (RXD3) pin is selected as a timer input, so that the pulse
widths of a sync break field and a sync field can be measured by the timer.
Bits 2 to 4 of ISC are used to prevent through current from entering when using the TI04/SEGxx/P53,
TI02/SEGxx/P52, and RxD3/SEGxx/P50 pins as segment outputs or port outputs.
The segment output pins to be used alternatively with the TI04, TI02, and RxD3 pins are internally connected with a
Schmitt trigger buffer. When using these pins as segment outputs or port outputs, bits 2 to 4 of ISC must be set to 0
(prohibiting input to Schmitt trigger buffers) in order to prevent through current from entering.
ISC can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Remark The segment output pins to be used alternatively with the TI02, TI04, and RxD3 pins vary, depending on
the product.
• 78K0R/LF3:
TI04/SEG27/P53, TI02/SEG28/P52, RxD3/SEG30/P50
• 78K0R/LG3: TI04/SEG36/P53, TI02/SEG37/P52, RxD3/SEG39/P50
• 78K0R/LH3:
TI04/SEG50/P53, TI02/SEG51/P52, RxD3/SEG53/P50
R01UH0004EJ0501 Rev.5.01
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Jun 20, 2011