PC87591L datasheet(206/437 Pages) NSC

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Embedded Controller Modules (Continued)

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Revision 1.07

ACB Own Address Register (ACBnADDR and ACBnADDR2)

The ACBnADDR and ACBnADDR2 registers hold the module’s ACCESS.bus addresses. The reset value of these registers

are undefined.

ACBnADDR:

Location: Channel 1 - 00 FF6816

Channel 2 - 00 FFE816

ACBnADDR2:

Location: Channel 1- 00 FE6C16

Channel 2- 00 FFEC16

Type: R/W

ACB Control Register 2 (ACBnCTL2)

The ACBnCTL2 register enables/disables the module and determines the ACB clock rate. On reset and while the module is

disabled (ENABLE in ACBnCTL2 register is set to 0), ACBnCTL2 is cleared (0016).

Location: Channel 1 - 00 FF6A16

Channel 2 - 00 FFEA16

Type: R/W

Bit

76543210

Name

SAEN

ADDR

Bit

Description

6-0

ADDR (Address). Holds the 7-bit ACCESS.bus address of the PC87591x. When in Slave mode, the first seven

bits received after a Start Condition are compared to this field (the first bit received is compared to bit 6, the next

bit to bit 5 and so on until the last bit, which is compared to bit 0). If the address field matches the received data

and SAEN in ACBnADDR register is set to 1, a match is declared.

SAEN (Slave Address Enable). When set (1), indicates that the ADDR ﬁeld holds a valid address and enables

the match of ADDR to an incoming address byte. When cleared, the ACB does not check for an address match.

Bit

76543210

Name

SCLFRQ6-0

ENABLE

Reset

00000000

Bit

Description

ENABLE. When set, the ACB module is enabled. When the Enable bit is cleared, the ACB module is disabled,

ACBnCTL1, ACBnST and ACBnCST are cleared and the clocks are halted.

7-1

SCLFRQ6-0 (SCL Frequency bits 6 through 0). This ﬁeld, together with SCLFRQ8-7 in ACBCTL3 register,

defines the SCL’s period (low time and high time) when the PC87591x serves as a bus master. The clock low

time and high time are defined as follows:

tSCL =4*SCLFRQ*tCLK

tSCLl =tSCLh

where tCLK is the PC87591x clock cycle when in Active mode (see Section 7.6.3 on page 385).

SCLFRQ may be programed to values in the range of 00 00010002 (810) through 11 11111112 (51110). Values

outside this range gives unpredictable results.

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