Register Bank Pointer RP | Fujitsu F202RA, MB89202 specification

CHAPTER 3 CPU

3.2.2Register Bank Pointer (RP)

The register bank pointer (RP) is the upper 8 bits of the program status register (PS). The register bank pointer indicates the general-purpose register bank address being used, and the address is converted to the actual address in general-purpose register addressing.

■Configuration of the Register Bank Pointer (RP)

Figure 3.2-4shows the configuration of the register bank pointer.

Figure 3.2-4 Configuration of Register Bank Pointer

CCR

bit15

bit14

bit13

bit12

bit11

bit10

bit9

bit8

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

RP initial value

IL1

IL0

XXXXXXXXB

X: Undefined

The register bank pointer indicates the address of the register bank being used. Figure 3.2-5shows the rule of conversion from the register bank pointer bits to the actual address.

Figure 3.2-5 Rule of Conversion from the RP Bits to the Actual Address

RP upper bits

Lower bits of operation code

"0"

"1"

Address

A15

A14

A13

A12

A11

A10

generated

The register bank pointer specifies a memory block (register bank) used as a general-purpose register in the RAM area. There are 32 register banks. Setting a value (from 0 to 31) in the upper five bits of the register bank pointer specifies a register bank. One register bank contains eight 8-bit general-purpose registers that are selected with the lower 3 bits of an operation code.

The register bank pointer allows a range of 0100H to 01FFH (maximum) to be used as the general-purpose register area. However, some models restrict the usable range when only internal RAM is used. The initial value of the register bank pointer specified after the reset operation is undefined.

Note:

Be sure to set up the register bank pointer (RP) before using general-purpose registers.

The register bank pointer is part of the program status register (PS), and thus is not allowed to access only the register bank pointer.

F202RA, MB89202 specifications

The Fujitsu MB89202 and F202RA microcontrollers are part of the 16-bit microcontroller family, renowned for their robust performance and versatility in a variety of embedded system applications. These devices are tailored for high-efficiency operation across diverse industries, including automotive, consumer electronics, and industrial automation.

One of the main features of the MB89202 is its powerful CPU core, which operates at a clock speed of up to 20 MHz. This enables the microcontroller to perform complex calculations and consumer-grade applications seamlessly. The architecture is designed to handle multiple tasks effectively, making it suitable for real-time operations.

Memory capacity is a vital characteristic of the MB89202, featuring on-chip RAM and ROM configurations. The microcontroller can accommodate different memory variants, providing developers with flexibility in memory allocation based on their application requirements. This adaptability facilitates applications ranging from simple control systems to complex data processing tasks.

The F202RA variant extends the capabilities of the MB89202 by integrating advanced peripheral functions. It includes built-in timers, A/D converters, and serial communication interfaces, which are essential for interfacing with other hardware components or sensors. The availability of these peripherals reduces the need for additional external circuits, thus contributing to a more compact and cost-effective design.

In terms of power management, the MB89202 series employs advanced power-saving technologies. The microcontroller offers various low-power modes, enabling devices to conserve energy during idle times, making it highly suitable for battery-operated applications. This characteristic not only enhances the efficiency of devices but also extends their operational lifespan.

Moreover, the Fujitsu MB89202 series incorporates robust protection features, including watchdog timers and failure detection mechanisms. These safety features ensure reliable operation in critical systems, making them a preferred choice in applications where failure is not an option.

The MB89202 and F202RA microcontrollers also support a range of development tools and environments, including integrated development environments (IDEs) and software libraries, which facilitate rapid application development. With these tools, developers can efficiently prototype, debug, and optimize their applications.

In summary, the Fujitsu MB89202 and F202RA microcontrollers stand out with their efficient performance, extensive memory options, integrated peripherals, and power-saving capabilities, making them ideal for a wide array of embedded applications. Their reliability and robustness further enhance their attractiveness for designers seeking advanced microcontroller solutions.

Fujitsu F202RA, MB89202 manual Register Bank Pointer RP, Configuration of Register Bank Pointer

Models: F202RA MB89202