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2-17

7220 Group User’s Manual

2.3 Memory assignment

FUNCTIONAL DESCRIPTION

2.3.3 DA registers (addresses 00CE16 and 00CF16)

The DA-H register is assigned to address 00CE16, and the DA-L register is assigned to address 00CF16

Both registers consist of 8 bits.

The DA-H register is used to set the high-order 8 bits of 14-bit PWM output data. The DA-L register is used

to set the low-order 6 bits of 14-bit PWM output data (set to bits 0 to 5). Bits 7 is not used.

2.3.4 PWM registers (addresses 00D016 to 00D416 and 00F616)

The PWM0 to PWM4 registers are assigned to addresses 00D016 to 00D416 and PWM5 register is

address 00F616. All registers consist of 8 bits.

These registers are used to set the output data corresponding to six 8-bit PWM (PWM0–PWM5).

2.3.5 PWM output control registers (addresses 00D516 and 00D616)

The PWM output control register 1 is assigned to address 00D516 and the PWM output control register 2

is assigned to address 00D616.

Both registers consist of 8 bits, and used to select the PWM count source etc. The high-order 3 bits and

the low-order 2 bits of the PWM output control register 2 are not used.

2.3.6 Multi-master I2C-BUS related registers (addresses 00D716 to 00DB16)

The I2C data shift register, the I2C address register, the I2C status register, I2C control register and the I2C

clock control register are assigned to addresses 00D716, 00D816, 00D916, 00DA16 and 00DB16 respectively.

All registers consist of 8 bits.

The I2C data shift register is a 8-bit shift register to store receive data and write transmit data.

The I2C address register consists of a 7-bit slave address and a read/write bit.

The I2C status register controls the I2C-BUS interface status. The low-order 4 bits are read-only bits and

the high-order 4 bits can be read out and written to.

The I2C control register controls data communication format.

The I2C clock control register is used to set ACK control, SCL mode and SCL frequency.

2.3.7 Serial I/O related registers (addresses 00DC16 and 00DD16)

The serial I/O mode register is assigned to address 00DC16 and the serial I/O register is assigned to

address 00DD16. Both registers consist of 8 bits.

The serial I/O mode register is used to select the synchronous clock and the serial I/O port function by its

low-order 4 bits. Bit 5 selects the transfer direction, and bit 6 selects the serial data input pin. Bit 4 is set

to “0.” Bit 7 is not used.

The serial I/O register is used to write transfer data.

2.3.8 CRT display related registers (addresses 00E016 to 00EC16)

(1)

Horizontal position register (address 00E016)

The horizontal position register is assigned to address 00E016. This register consists of 8 bits, and

is used to specify the horizontal position of CRT display. Bits 7 and 6 are not used.

(2)

Vertical display position registers (addresses 00E116 and 00E216)

The vertical display position register 1 is assigned to address 00E116 and the vertical display position

used to set the vertical position to start display. Bit 7 of each register is not used.

(3)

Character size register (address 00E416)

The character size register is assigned to address 00E416. This register consists of 8 bits, and is used

to specify one of the three sizes of display characters. Bits 4 to 7 are not used.

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