upd75238 Renesas Electronics Corporation., upd75238 Datasheet - Page 130
upd75238
Manufacturer Part Number
upd75238
Description
4 Bit Single-chip Microcomputer
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD75238.pdf
(190 pages)
- Current page: 130 of 190
- Download datasheet (2Mb)
130
(10) Key scan registers (KS0, KS1, and KS2)
(11) Key scan flag (KSF)
The key scan registers (KS0, KS1, and KS2) set segment output data on the key scan timing that is mapped
to display data memory locations (1FCH, 1FDH, 1FEH, 1FFH, 1BEH, and 1BFH).
KS0, KS1, and KS2 are 8-bit registers, which are usually manipulated with an 8-bit manipulation
instruction. (One-bit or 4-bit manipulation is also possible for the lower 4 bits.)
The data set in KS0, KS1, and KS2 is output on the segment output pins on the key scan timing. During
the key scan timing, the rewriting of KS0, KS1, and KS2 is immediately reflected in segment output data,
which can be used for key scanning.
The key scan flag (KSF) is set to 1 on the key scan timing, and is automatically reset to 0 on any other
timing. KSF is mapped to bit 3 at address F8AH, and can be tested on a single-bit basis. KSF cannot
be written to. Testing this flag can determine whether the key scan timing is present, so that the validity
of key input data can be determined.
PD75238
Related parts for upd75238
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Renesas Technology Corp [Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series]
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
RENESAS MCU M16C FAMILY / M16C/Tiny SERIES
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Renesas Starter Kit for RX210
Manufacturer:
Renesas Electronics Corporation.
Part Number:
Description:
EVALBOARD/Renesas StarterKit for RX630
Manufacturer:
Renesas Electronics Corporation.
Part Number:
Description:
EVALBOARD/Renesas Starter Kit+ for RX63N
Manufacturer:
Renesas Electronics Corporation.
Part Number:
Description:
EVALBOARD/Renesas Starter Kit
Manufacturer:
Renesas Electronics Corporation.
Part Number:
Description:
FLASH PROGRAMMER FOR RENESAS MICROCONTROLLERS
Manufacturer:
Renesas Electronics Corporation.
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Manufacturer:
Renesas Electronics Corporation.
Datasheet: