UPD78F9234MC-5A4-A Renesas Electronics America, UPD78F9234MC-5A4-A Datasheet - Page 48

• Manufacturer Part Number: UPD78F9234MC-5A4-A
• Description: MCU 8BIT 8KB FLASH 30PIN
• Manufacturer: Renesas Electronics America
• Series: 78K0S/Kx1+r

Specifications of UPD78F9234MC-5A4-A

• Core Processor: 78K0S
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 24
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

3.4.2 Short direct addressing
46
[Function]
[Operand format]
[Description example]
[Illustration]
The memory to be manipulated in the fixed space is directly addressed with the 8-bit data in an instruction word.
The fixed space where this addressing is applied is the 256-byte space FE20H to FF1FH (FE20H to FEFFH
(internal high-speed RAM) + FF00H to FF1FH (special function registers)).
The SFR area where short direct addressing is applied (FF00H to FF1FH) is a part of the total SFR area. In this
area, ports which are frequently accessed in a program and a compare register of the timer counter are mapped,
and these SFRs can be manipulated with a small number of bytes and clocks.
When 8-bit immediate data is at 20H to FFH, bit 8 of an effective address is cleared to 0. When it is at 00H to
1FH, bit 8 is set to 1. See [Illustration] below.
EQU DATA1 0FE90H; DATA1 indicates FE90H in saddr area
MOV DATA1, #50H; When the immediate data to 50H
Effective
address
Identifier
saddrp
15
saddr
When 8-bit immediate data is 20H to FFH,
When 8-bit immediate data is 00H to 1FH,
7
1
1
Instruction code
1
saddr-offset
OP code
Label or FE20H to FF1FH immediate data
Label or FE20H to FF1FH immediate data (even address only)
1
1
1
1
1
0
1
CHAPTER 3 CPU ARCHITECTURE
0
1
1
0
8
User’s Manual U17446EJ5V0UD
1
0
0
Description
1
1
1
= 1.
= 0.
0
0
0
1
0
0
0
0
0
0
1
0
0
OP code
90H (saddr-offset)
50H (immediate data)
Short direct memory