CS89712 datasheet(80/170 Pages) CIRRUS

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CS89712

DS502PP2

Bit

Description

0:3

Keyboard scan: This 4-bit field defines the state of the keyboard column drives. The following

table defines these states.

TC1M: Timer counter 1 mode. Setting this bit sets TC1 to prescale mode, clearing it sets free run-

ning mode.

TC1S: Timer counter 1 clock source. Setting this bit sets the TC1 clock source to 512 kHz, clear-

ing it sets the clock source to 2 kHz.

TC2M: Timer counter 2 mode. Setting this bit sets TC2 to prescale mode, clearing it sets free run-

ning mode.

TC2S: Timer counter 2 clock source. Setting this bit sets the TC2 clock source to 512 kHz, clear-

ing it sets the clock source to 2 kHz.

UART1EN: Internal UART enable bit. Setting this bit enables the internal UART.

BZTOG: Bit to drive (i.e., toggle) the buzzer output directly when software mode of operation is

selected (i.e., bit BZMOD = 0). See the BZMOD and BUZFREQ (SYSCON1) bits for more

details.

BZMOD: This bit selects the buzzer drive mode. When BZMOD = 0, the buzzer drive output pin

is connected directly to the BZTOG bit. This is the software mode. When BZMOD = 1, the buzzer

drive is in the hardware mode. Two hardware sources are available to drive the pin. They are the

TC1 or a fixed internally generated clock source. The selection of which source is used to drive

the pin is determined by the state of the BUZFREQ bit in the SYSCON2 register. If the TC1 is

selected, then the buzzer output pin is connected to the TC1 under flow bit. The buzzer output

pin changes every time the timer wraps around. The frequency depends on what was pro-

grammed into the timer. See the description of the BUZFREQ and BZTOG bits (SYSCON2) for

more details.

Table 37. SYSCON1

Keyboard Scan

Column

All driven high

All driven low

2–7

All high impedance (tristate)

Column 0 only driven high all others high impedance

Column 1 only driven high all others high impedance

Column 2 only driven high all others high impedance

Column 3 only driven high all others high impedance

Column 4 only driven high all others high impedance

Column 5 only driven high all others high impedance

Column 6 only driven high all others high impedance

Column 7 only driven high all others high impedance

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