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P90CL301BFH/F3

Low voltage 16-bit microcontroller

Philips Electronics 

Philips Semiconductors

Low voltage 16-bit microcontroller

Preliminary specification

P90CL301BFH (C100)

Table 12 Bus size depending on BSIZE, CSBTX and BSn (n = 0 to 6)

PIN BSIZE BIT CSBTX

BUS SIZE OF CS0 TO CS6(1)

BSn = 0

BSn = 1

BUS SIZE OF CSBTX

AT

BOOT

AFTER

BOOT

0

0

16 bit

8 bit

16

16

0

1

16 bit

8 bit

16

8

1

0

note 2

8 bit

8

8

1

1

16 bit

8 bit

8

16

PORT PL AVAILABLE

(P0 TO P7)

no

yes

yes

no

Notes

1. Depending on bit BSn in register BSREG.

2. The default value after reset of bits BSn in register BSREG is logic 0 which corresponds to 16-bit mode for CS0 to

CS6. In this case, it is recommended to set BSn to logic 1 in the boot routine. Afterwards if CSBTX is set to logic 1,

BSn can be reset to logic 0 by software for further transfers in 16-bit mode.

6.4 System Control Register (SYSCON)

The P90CL301BFH uses a System Control Register (SYSCON) for adjusting system parameters.

Table 13 System Control Register (address FFFF 8000H)

15 14 13

12

11

10

9

8

7(1)

6(1)

54

3

2 1(2)

0

WDSC BPE CSBTX STBY PCLK3 PCLK2 PDE GF PCLK1 PCLK0 IM WD FBC PD IDL DOFF

Notes

1. The default values after a CPU reset: PCLK1 = 1 and PCLK0 = 1; all other SYSCON bits are a logic 0.

2. All bits are reset by the RESET instruction, except the IDL bit which is only reset by a CPU reset.

1996 Dec 11

11

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